$B=iEyNL;RNO3X(B2006$BG/EY9V5AO?Bh(B12$B2s(B

$B"+(B$BBh(B11 $B2s$X(B$B!!(B$BL\$B!!(B$BBh(B13$B2s(B$B"*(B

$BBh(B8$B>O(B $BJ*M}NL$H4|BTCM(B

$B!!A02s$GNL;RNO3X$NIT;W5D$J$H$3$m$r6/D4$7$9$.$?$N$G!":#2s$O!V$A$c$s$HNL(B $B;RNO3X$NCf$K$O8EE5NO3X$,F~$C$F$$$k$s$@$h!A!A!W$H$$$&$3$H$r6/D4$9$k$H$3$m$+$i;O$a$?!#$=$N!V8EE5NO3X$,F~$C$F$$$k!W$H$$$&$3$H$r3NG'$9$k$?$a$N:n6H$H(B $B$7$F!"!V8EE5NO3X$G$NNO3XJQ?t!aNL;RNO3X$N1i;;;R!W$H$$$&BP1~4X78$H!VNO3XJQ?t$NCM!a1i;;;R$N4|BTCM!W$H$$$&BP1~4X78$,I,MW$K$J$k!#(B
$B!!$H$$$&$o$1$G!"$3$N>O$O4|BTCM$N$*OC!#(B

8.1  $B:BI8$N4|BTCM(B


$B!!GHF04X?t$O>o$K$"$kDxEY$N9-$,$j$r;}$A$J$,$i;~4VH/E8$7$F$$$/!#$=$NGHF04X?t$N;~4VJQ2=$3$=$,!"$$$o$P!V1?F0!W$J$N$G$"$k$,!"$=$NGH$,0lIt$K6I:_$7$F$$(B $B$k$F!"$=$N0LCV$,F0$$$F$$$/$J$i$P!"$=$l$r2f!9$O!VN3;R$,1?F0$7$F$$$k!W$H$H$i$($k$3$H$,$G$-$k!#(B
$B!!8EE5E*$J!VN3;R$N1?F0!W$HGHF04X?t$NF0$-$rHf3S$9$k$?$a$K!"!VGHF04X?t$,$"$k7A$r$7$F$$$k;~!"N3;R$O$I$N$"$?$j$K$$$k$H9M$($l$P$h$$$N$+!W$H$$$&$3$H$r(B $B<($9NL$,I,MW$G$"$k!#(B
$B!!$=$N$h$&$J;XI8$H$7$F!"4|BTCM!J5-9f$G$O(B < x > $B!K$r;H$&$3$H$,B?$$!#GHF04X?t$,0l$D$N;3$N2t(B($BGHB+(B)$B$r;}$D$h$&$J;~!"(B < x > $B$O$^$5$K$=$N;3$NCf?4$r;X$7<($9$3$H$K$J$k(B($BJ#?t8D$N2t$,$"$k$J$i$P$=$NJ?6Q$N$H$3$m$K$/$k(B)$B!#(B

$B!!(B$BGH$,Fs$D$KJ,$+$l$k$h$&$J1?F0$O9M$($J$$$s$G$9$+!)(B
$B!!(B$B:#$3$3$GOC$=$&$H$7$F$$$k$N$O!"NL;RNO3X$N$&$A!"8EE5NO3X$H4X78$,$D$1$i(B $B$l$k$h$&$J>u67!J6I:_$7$?GH$N>u67!K$K$D$$$F$J$N$G!"$=$&$$$&>l9g$r9M$($J$$$3$H$K$7$^$7$g$&!#$=$&$$$&>lLL$K$D$$$F$O8e$G9M$($k$1$I!"$=$s$J>u67$G4|BT(B $BCM$r9M$($F8EE5NO3X$K7k$S$D$1$k$3$H$O$d$i$J$$J}$,$$$$$G$7$g$&!#$3$3$G<($7$?$$$N$O$"$/$^$G!VNL;RNO3X$,8EE5NO3X$r4^$`!JNL;RNO3X$NJ}$,Bg$-$$!K!W$H$$(B $B$&$3$H!#$@$+$i!"NL;RNO3X$G$7$+5-=R$G$-$J$$8=>]$b!"$b$A$m$s$"$k!#(B
$B!!6qBNE*$K$O!"4|BTCM$O0J2<$N$h$&$K7W;;$5$l$k!#$^$:0lHLE*$J!V4|BTCM!W$NDj5A$r=R$Y$h$&!#(B
$B!!$"$kJ*M}NL(BA$B$,$"$kCM(BAi$B$ri(i$B$O$$$m$s$J8=>]$r6hJL$9$kE:;z$G$"$k$H$9$k(B)$B$G$"$k;~!"(B
< A > =
$B-t(B
i 
fi Ai
(8.1)
$B$,!V(BA$B$N4|BTCM!W$G$"$k!#$?$H$($P(B100$BJ,$N(B1$B$N3NN($G(B1000$B1_$"$?$j!"(B10$BJ,$N(B1$B$N3NN($G(B100$B1_$"$?$k%/%8$G$"$l$P!"$b$i$($k>^6b$N4|BTCM$O(B
f1000$B1_Ev$j(B$B!_(B1000 + f100$B1_Ev$j(B$B!_(B100 + f$B30$l(B$B!_(B0 = 1
100
$B!_(B1000+ 1
10
$B!_(B100 + 89
100
$B!_(B0 = 20
(8.2)
$B$H$J$k!#$b$7$/$8$r(B100$B2s0z$1$P!"(B1000$B1_$,#12s!"(B100$B1_$,(B10$B2s$0$i$$Ev$?$k$@$m$&!#$9$k$H(B100$B2s$G(B2000$B1_$0$i$$>^6b$,$b$i$($k$3$H$K$J(B $B$k!#(B1$B2s$"$?$j(B20$B1_$G$"$k!#$D$^$j4|BTCM$O!"$=$N$/$8$r2?2s$b2?2s$b0z$$$?;~$K$b$i$($k$*6b$NJ?6QCM$KEy$7$$!#(B
$B!!NL;RNO3X$G$O3NN($7$+7W;;$G$-$J$$$N$G!"J*M}NL$=$N$b$N$G$O$J$/!"J*M}NL$N4|BTCM$,7W;;$G$-$k$3$H$K$J$k!# $B!!NL;RNO3X$G$O!"$"$kNL(BA$B$N4|BTCM$r(B < A > $B$N$h$&$K3g8L$G$/$/$C$FI=$9!#(B
$B!!$3$3$G$O(Bi$B$H$$$&ITO"B3$JE:;z$GJ*M}NL$N$$$m$s$JCM$rI=$7$?$,!"O"B3$JJQ2=$r$9$k>l9g$b$b$A$m$s$"$k!#(B $B$?$H$($P!"0LCV:BI8(Bx$B$OO"B3E*$KJQ2=$9$kJ*M}NL$G$"$k!#N3;R$,0LCV:BI8(Bx$B$+$i(Bx+dx$B$N4V$KB8:_$7$F$$$k3NN($O(B|$B&W(B(x)|2dx $B$G$"$k$+$i!"4|BTCM(B < x > $B$O!"(B
< x > = $B"i(B
x|$B&W(B(x,t)|2 dx = $B"i(B $B&W(B*(x,t) x $B&W(B(x,t) dx
(8.3)
$B$N$h$&$K$7$F7W;;$9$k$3$H$,$G$-$k(B($B$?$@$7&W$O5,3J2=$5$l$F$$$J$/$F$O$J$i$J$$(B)$B!#$3$3$G#3$D$a$N<0$G$O!"=gHV$rJB$YBX$($F(Bx$B$r&W(B*$B$H&W(B $B$N4V$KCV$$$F$$$k!#$3$l$O8e$G=P$F$/$k!V1?F0NL$N4|BTCM!W$d!V%(%M%k%.!<$N4|BTCM!W$N;~$H=gHV$rF1$8$K$9$k$?$a$G!"$3$NCJ3,$G$O?<$$0UL#$O$J$$!#(B
$B!!C1=c$J6k7AGH(B 
$B!!!!!!!!&W(B(x)= $B!P(B

1


$B"e(B

$B&D(B

a < x < a+$B&D(B
0
$B$=(B $B$l0J30(B
         
(8.4)
$B$N$h$&$J>l9g(B($B$3$3$G$O;~4V0MB8@-$rL5;k$7$F$$$k!#

$B"i(B dx $B&W(B* x $B&W(B = $B"i(B a+$B&D(B

a 
dx 1
$B&D(B
x = 1
$B&D(B

[
x2
2
]
a+∆

a 
= 1
2$B&D(B
((a+$B&D(B)2$B!](Ba2) = 1
2$B&D(B
(2a$B&D(B+$B&D(B2) = a+ $B&D(B
2

(8.5)
$B$H$J$C$F!"3N$+$KGH$NCf?4$G$"$k!#8EE5NO3X$G!VN3;R$N0LCV!W$H2f!9$,4QB,$9$k$b$N$O$3$N$h$&$J(B < x > $B$G$"$k!#$?$@$7!"$?$$$F$$$N>l9gGH$N9-$,$j$OB,Dj5!4o$N8m:9$NCf$KKd$b$l$F$7$^$&!#(B
$B!!4|BTCM$O$3$N$h$&$K$7$FA4BN$NJ?6Q$H$7$F7W;;$9$k$N$G!"GHF04X?t$,Fs$D$NGH$KJ,$+$l$F$7$^$&$h$&$J>l9g$K$D$$$F7W;;$9$k(B $B$H!"l=j$K4|BTCM$,Mh$F$7$^$&>l9g$b$"$k!#$=$N$?$a!"GH$,$I$NDxEY9-$,$C$F$$$k$+$r<($9?tCM!J1&$N?^$N(B∆x$B$N$h$&$J$b(B $B$N!K$bI,MW$K$J$k$,!"$=$l$K$D$$$F$O8e$G7W;;$7$h$&!#(B

8.2  $B:BI84|BTCM$N1?F0(B

$B!!A0@a$GDj5A$5$l$?(B < x > $B$,;~4VE*$K$I$&JQ2=$9$k$+$r8+$F$*$3$&!#$=$N$?$a$K(B[d/dt] < x > $B$H$$$&7W;;$r9T$&!#$3$N>l9g!"(Bx$B$O;~4V$K0MB8$;$:!"0MB8$9$k$N$O&W(B(x,t)$B$NJ}$G$"$k$3$H$K5$$r$D$1$k!#NL;RNO3X$G$O(B1$B!";~4V$K$h$C$FJQ2=$7$F$$$/NO3XJQ?t$O(B $B:BI8(Bx$B$d1?F0NL(Bp$B$G$O$J$/!"GHF04X?t&W(B(x,t)$B$J$N$G$"$k!#NL;RNO3X$G$O(Bx$B$O$b$O$dNO3XJQ?t$G$O$J$$!J$@$+$i(Bx(t)$B$G$O$J$$!*!K!#(B

$B!!NO3XJQ?t$,(Bx(t),p(t)$B$+$i&W(B(x,t)$B$HJQ$o$C$?$3$H$r$?$H$(OC$G@bL@$7$F$*$/!#9-$$1?F0>l$K0l?M$N?M4V$,Av$j2s$C$F$$$k$N$r8+$F$$$k$H$7$h(B $B$&!#$3$N!V>uBV!W$rCN$k$K$O!"$=$N?M$,$I$3$K$$$k$+!J(Bx(t)$B!K$H!"$I$l$0$i$$$N1?F0NL$GF0$$$F$$$k$+!J(Bp(t)$B!K$rCN$l$P$h$$!#$3$l$,8EE5NO3XE*1?F0$K(B $BBP1~$9$k!#(B
$B!!$3$l$KBP$7!"NL;RNO3XE*$J1?F0$KBP1~$9$k$N$O!"1?F0>l0lGU$K$.$C$7$j$H?M$,N)$C$F$$$F!"%5%C%+!<$N1~1g$J$I$G$d$k!V%&%'!<%V!W$r$d$C$F$$$k$H$3$m$G$"(B $B$k!#%&%'!<%V$,F0$$$F$$$/;Q$,GHB+$NF0$$$F$$$/;Q$9$J$o$AN3;R$NF0$$$F$$$/;Q$KBP1~$9$k!#GHF04X?t$N;3$K$J$C$F$$$k$H$3$m$,0\F0$7$F$$$/$3$H$,8EE5E*$J0U(B $BL#$NN3;R$N0\F0$J$N$G$"$k!#$3$N$h$&$K!VGHF04X?t$,;~4VE*$KJQ2=$7$F!"$=$l$K$h$C$FN3;R$N$$$=$&$J>l=j!J4|BTCM!K$bJQ2=$7$F$$$/!W$H$$$&9M$(J}$r$9$k$J$i(B $B$P!"GHF04X?t&W(B(x,t)$B$O6u4V$N3FE@3FE@$K0l8D$:$DB8:_$9$k!VNO3XJQ?t!W$G$"$j!"$9$Y$F$N&W(B(x,t)$B$r7h$a$F$=$N;~4VH/E8$r9M$($J$/$F$O$$$1$J$$!#$=(B $B$7$F!"$3$NN)>l$G$O(Bx$B$O;~4VE*$KJQ2=$9$k$b$N$G$O$J$/!"!V$?$/$5$s$"$k&W$N$&$A!"$I$l$r9M$($F$$$k$N$+$r;XDj$9$kL>;%!J%i%Y%k!K!W$G$7$+$J$$!J%&%'!<%V$,(B $B0\F0$7$F$bCe@J$7$F$$$k?M$O0\F0$7$J$$!K!#(B
$B!!$7$?$,$C$F!"(B < x > $B$r;~4V(Bt$B$GHyJ,$9$k;~!"HyJ,$5$l$k$N$O&W(B*(x,t)$B$H&W(B(x,t)$B$NFs$D$G$"$k!#(B

 $B$3$l$,$o$+$C$F$J$$?M$O!"(B

d
dt

<x>= $B"i(B dx $B!J(B $B&W(B*(x,t) dx
dt
$B&W(B(x,t) + .....
)

$B$H$$$&$U$&$K!"??$sCf$N#x$+$iHyJ,$7$F$7$^$&!#$3$l$O!"(B$B@dBP$d$C$F$O$$$1$J$$4V0c$$(B$B!J$G$b!"$b$N(B $B$9$4$/B?$$!K!#??$sCf$N#x$O>e$G8@$($P!V%&%'!<%V$r$7$F$$$k?M$N:B@JHV9f!W$KBP1~$9$k$b$N$G$"$C$F!";~4V$K$h$C$FJQ2=$7$J$$!#(B

$B$f$((B $B$K!"HyJ,$N7k2L$O(B


d
dt

$B"i(B dx $B&W(B*(x,t) x $B&W(B(x,t)
= $B"i(B dx $B!J(B $B&W(B*(x,t)x $B"_(B
$B"_(Bt
$B&W(B(x,t)+ $B"_(B
$B"_(Bt
$B&W(B*(x,t)x$B&W(B(x,t) )

(8.6)
$B$H$J$k!#(B

$B!Z0J2$B$3$NItJ,$O!":G=i$KJY6/$9$k;~$OM}2r$G$-$J$/$H$b$h$$!#(B
$B!!$?$^$K!"!V$3$N<0$N:8JU$G$OHyJ,$,>oHyJ,(B[d/dt]$B$J$N$K!"1&JU$K9T$/$HJPHyJ,(B[$B"_(B/$B"_(Bt]$B$K$J$C$F$$$k!#$*$+$7$$$G$O$J$$$+!W$H/$7@bL@$7$F$*$/!#(B
$B:8JU$K$*$$$FHyJ,$5$l$F$$$k"i&W(B*(x,t)$B&W(B(x,t) dx$B$K$*$$$F$O!"(Bx$B$O$9$G$K@QJ,$,=*$o$C$F$$$k(B($B$D$^$j!"(Bx$B$O$$$m$s$JCM$,BeF~$5$l$FB-$7;;$,=*$o$C$F$$$k(B)$B$N$G!" $B!V1&JU$N&W(B(x,t)$B$NCf$K$O(Bx$B$,$"$k!#$3$N(Bx$B$r(Bt$B$GHyJ,$7$?$i(B[dx/dt]$B$O=P$F$-$=$&$J5$$,$9$k!W$HIT0B$K;W$&?M$b$$$k$+$b$7$l$J$$!#$7$+$7!"(B $B%&%'!<%V$NNc$($G@bL@$7$?$h$&$K!"&W(B(x,t)$B$NCf$N(Bx$B$O;~4V$K$h$C$FJQ2=$9$kNL$G$O$J$$$N$G$"$C$F!"8EE5NO3X$G$N>l=j$rI=$9(Bx(t)$B$H$O0c$&$b$N$G$"$k(B $B$3$H$KCm0U$7$J$/$F$O$$$1$J$$!#$3$N(Bx$B$O!V>l=j(Bx$B!";~9o(Bt$B$G$NGHF04X?t&W(B(x,t)$B!W$N$h$&$K&W$N>l=j$r;XDj$9$k!"$$$o$P!V%i%Y%k!W$^$?$O!VHVCO!W$J$N$G(B $B$"$k!#$3$l$KBP$7!"8EE5NO3X$N(Bx(t)$B$ON3;R$NB8:_$7$F$$$k0LCV$G$"$j!"0UL#$,0c$&!#$3$NFs$D$N(Bx$B$N0c$$$O!"N.BNNO3X$G$N(BLagrange$B$NJ}K!$H(B Euler$B$NJ}K!$N0c$$$HK\
$B!ZD9$$Cp=*$o$j![(B
$B!!$3$3$G%7%e%l!<%G%#%s%,![$B"_(B/$B"_(Bt]$B&W(B = [$B!](B[hbar.png2/2m][($B"_(B2)/($B"_(Bx2)] +V(x)]$B&W$,@.N)$7$F$$$k$b$N$H$7$F!"(B

$B"_(B
$B"_(Bt
$B&W(B = $B!](Bi
hbar.png

[ $B!](B hbar.png2
2m

$B"_(B2
$B"_(Bx2
+V(x) ] $B&W(B   $B$*$h$S(B     $B"_(B
$B"_(Bt
$B&W(B*= i
hbar.png

[ $B!](B hbar.png2
2m

$B"_(B2
$B"_(Bx2
+V(x) ] $B&W(B*
(8.7)
$B$rBeF~$9$k!#$9$k$H!"(B



d
dt

$B"i(B dx $B&W(B*(x,t) x $B&W(B(x,t)

= $B"i(B dx $B!J(B $B&W(B*(x,t)x $B!](Bi
hbar.png

[ $B!](B hbar.png2
2m

$B"_(B2
$B"_(Bx2
+V(x) ] $B&W(B(x,t)+ i
hbar.png

[ $B!](B hbar.png2
2m

$B"_(B2
$B"_(Bx2
+V(x) ] $B&W(B*(x,t)x$B&W(B(x,t) )

(8.8)
$B$H$J$k!#$3$3$G(BV(x)$B$KHfNc$9$kItJ,$OF1$8$b$N$,5UId9f$K$J$C$F$$$k$N$G>C$($k!#@0M}$9$k$H!"(B


d
dt

$B"i(B dx $B&W(B*(x,t) x $B&W(B(x,t)
= ihbar.png
2m

$B"i(B dx $B!J(B $B&W(B*(x,t)x $B"_(B2
$B"_(Bx2
$B&W(B(x,t)$B!](B $B!J(B $B"_(B2
$B"_(Bx2
$B&W(B*(x,t) ) x$B&W(B(x,t) )

(8.9)
$BBh#29`$N&W(B*$B$NJ}$K$+$+$C$F$$$kHyJ,$rItJ,@QJ,$r;H$C$F30$7$F$$$/!#$3$N;~!"@QJ,HO0O$NC<$C$3!J$?$$$F$$$N>l9g$O(Bx=$B!^!g$@$m$&!K(B $B$G$O&W$d$=$NHyJ,$O#0$K$J$C$F$$$k$H$7$F!"I=LL9`(B2$B$O(B $BL5;k$7$h$&!#ItJ,@QJ,$N7k2L$O(B


$B"i(B dx $B"_(B2
$B"_(Bx2
$B&W(B* x $B&W(B =
$B!](B $B"i(B dx $B"_(B
$B"_(Bx
$B&W(B* $B"_(B
$B"_(Bx
( x $B&W(B)
=

$B"i(B dx$B&W(B* $B"_(B2
$B"_(Bx2
( x $B&W(B)
=

$B"i(B dx$B&W(B* $B!J(B x $B"_(B2
$B"_(Bx2
$B&W(B+ 2 $B"_(B
$B"_(Bx
$B&W(B )

(8.10)
$B$H$J$k!#$3$NBh#19`$O:G=i$+$i$"$C$?(B[($B"_(B2)/($B"_(Bx2)]$B&W$N9`$H>C$79g$&!#;D$k$N$O!"(B


d
dt

$B"i(B dx $B&W(B*(x,t) x $B&W(B(x,t)
= $B!](Bihbar.png
m

$B"i(B dx $B&W(B*(x,t) $B"_(B
$B"_(Bx
$B&W(B(x,t)

(8.11)
$B$H$J$k!#$3$N<0$r$h$/8+$k$H!"(B1/m$B"i(Bdx $B&W(B*(x,t)($B!](Bihbar.png[$B"_(B/$B"_(Bx]) $B&W(B(x,t)$B$N$h$&$K!"&W(B*$B$H&W$N4V$K1?F0NL1i;;;R!](Bihbar.png[$B"_(B/$B"_(Bx]$B$,$O$5$^$C$?7A$K(B $B$J$C$F$$$k!#$3$l$O!V1?F0NL$N4|BTCM!W$H9M$($F$h$$NL$K$J$C$F$$$k!#$3$l$,BEEv$G$"$k$3$H$O8e$G<($9$H$7$F!"$H$j$"$($:"i(Bdx $B&W(B*(x,t)($B!](Bihbar.png[$B"_(B/$B"_(Bx]) $B&W(B(x,t)$B$r(B < p > $B$H=q$$$F$*$/$H!"(B

d
dt
< x > = 1
m
< p >
(8.12)
$B$,<($5$l$?$3$H$K$J$k!#$3$l$O$D$^$j!"(Bp=mv$B$G$"$k!#8EE5NO3XE*$K$O$"$?$j$^$($N<0$G$"$k$,!"NL;RNO3X$NCf$G$O$3$N$h$&$K4|BTCM$N7A$G $B!!$J$*!"$3$3$G9T$C$?$N$O(B < x > $B$N7W;;$G$"$k$,!"(Bx$B$r64$^$J$$"i&W(B*(x,t)$B&W(B(x,t) dx$B$r;~4VHyJ,$9$k$H(B0$B$K$J$k$3$H$,7W;;$G$-$k!J>OKv$N1i=,LdBj$r;2>H!#$7$+$76qBNE*$K7W;;$7$J$/$F$b!"$3$3$G$N7W;;$,$3$&$bJ#;($K$J$C$?$N$O(Bx$B$,64$^$C(B $B$F$$$?$+$i$G$"$j!"$=$l$,$J$1$l$PEz$,(B0$B$K$J$k$3$H$OM}2r$G$-$k$@$m$&!K!#(B

$B!!$H8@$o$l$F$b$o$+$i$J$$?M$O!">e$N7W;;<0$G!"??$sCf$KF~$C$F$$$k(Bx$B$r(B1$B$K(B $B=q$-49$($k$H$I$&$J$k$+$r$d$C$F$_$k$3$H!*(B
$B!!$3$&$J$k$N$OEvA3$G!"$b$7$3$&$J$i$J$+$C$?$i!""i&W(B* $B&W(Bdx=1$B!"$D$^$jA43NN($,#1$G$"$k$H$$$&>r7o$,!";~4V$,7P$D$H@.N)$7$J$/$J$C$F$7$^$&!#(B

8.3  $B1?F0NL$N4|BTCM(B

$B!!1?F0NL$N4|BTCM$,"i&W(B* ($B!](Bihbar.png[$B"_(B/$B"_(Bx]) $B&W(Bdx$B$G7W;;$G$-$k$H$$$&$3$H$r3NG'$7$h$&!#$?$@$7!"$3$N@a$G$O5,3J2=$NLdBj$r4JC1$K$9$k$?$a$K!"(Bx$B$NHO0O$r!]&P(B < x < $B&P$H$7!"<~4|6-3&>r7o$r$*$/(B3$B!#(B
[$B!]&P(B,$B&P(B]$B$G<~4|E*$G$"$k4X?t$O(B
f(x)= 1


$B"e(B

2$B&P(B

$B!g(B
$B-t(B
n=$B!]!g(B 
Fn einx
(8.13)
$B$N$h$&$K%U!<%j%(5i?t$GE83+$G$-$k!#A0$K=P$F$-$?%U!<%j%(5i?t(B()$B$O(Bcosnx,sinnx$B$r;H$C$F$$$?$,!"$3$3$G$O(Beinx$B$r(B $B;H$C$F$$$k!#(Beinx=cosnx + isinnx$B$G$"$k$3$H$r;W$$=P$;$P!">e$N<0$O(B

f(x) =

1


$B"e(B

2$B&P(B

$B!g(B
$B-t(B
n=$B!]!g(B 
Fn (cosx + isinnx)
=

1


$B"e(B

2$B&P(B
F0 + 1


$B"e(B

2$B&P(B

$B!g(B
$B-t(B
n=0 
[ (Fn+F$B!](Bn)cosx + i(Fn$B!](BF$B!](Bn)sinnx]

(8.14)
$B$H$J$k!#(B

1


$B"e(B

2$B&P(B
F0= 1
2
a0,   1


$B"e(B

2$B&P(B
(Fn+F$B!](Bn) = an,   i


$B"e(B

2$B&P(B
(Fn$B!](BF$B!](Bn) = bn
(8.15)
$B$H$9$l$P$3$N<0$O(B()$B$HF1$8$G$"$k!#(Ban,bn$B$Or7o$,2]$5(B $B$l$F$$$k$J$i!"(B(Fn)*=$B!](BF$B!](Bn$B$K$J$C$F$$$J$/$F$O$$$1$J$$!#(B
$B!!$3$N$h$&$KGH?t(Bn$B$r;}$C$?GH(Beinx$B$rE,Ev$J=E$_(BFn$B$r$+$1$FB-$7;;(B($B=E$M9g$o$;(B)$B$7$F$$$/$3$H$G!"$$$m(B $B$s$J7A$N4X?t$r:n$k$3$H$,$G$-$k(B4$B!#(B $B$3$N(Bn$B$O@0?t$K8B$k$,!"$=$l$O<~4|6-3&>r7o&W(B($B&P(B)=$B&W(B($B!]&P(B)$B$rK~B-$9$k$h$&$K$G$"$k!#(B
$B!!$3$N4X?t(Bf(x)$B$rGHF04X?t$@$H9M$($k$H!"GH?t(Bn$B$H$$$&$3$H$O1?F0NL(Bhbar.png n $B$r;}$C$F$$$k$H$$$&$3$H$@$+$i!"(BFn$B$O!"!VGHF04X?t$NCf$K1?F0NL(Bhbar.png n $B$r;}$C$?@.J,$,$I$NDxEY4^$^$l$F$$$k$+!W$r<($9?t$@$H8@$&$3$H$,$G$-$k!#3NN($O&W(B*$B&W$KHfNc$9$k$+$i!"1?F0NL$,(B hbar.pngn $B$K$J$k3NN($O(BF*n Fn$B$KHfNc$9$k(B(Fn$B$O0lHL$KJ#AG?t$G(B $B$"$k$3$H$KCm0U!#$&$^$/5,3J2=$5$l$F$$$l$P!"!VHfNc$9$k!W$G$O$J$/(BF*F$B$O3NN($=$N$b$N$H$J$k(B)$B!#(B
$BC1=c$JNc$r9M$($h$&!#$"$kGHF04X?t$,(B
$B&W(B(x)= 1


$B"e(B

2$B&P(B
( F1 eix+ F2 e2ix+F3e3ix)
(8.16)
$B$N$h$&$K!"#3$D$NGHF04X?t$NOB$H$7$FM?$($i$l$?$H$9$k!#3F@.J,$G$"$k$H$3$m$N(Beix,e2ix,e3ix$B$O(B $B$=$l$>$l!"(Bhbar.png,2hbar.png,3hbar.png$B$N(B $B1?F0NL$r;}$C$F$$$kN3;R$rI=$9GHF04X?t$H2r1,F2,F3$B$O$=$l$>$l$NGH(B $B$,$I$NDxEY:.$8$C$F$$$k$+$rI=$9?t;z$G$"$k!#$^$:5,3J2=>r7o$r9M$($k!#&W(B*$B&W$r@QJ,$9$k$H(B


$B"i(B $B&P(B

$B!]&P(B 
$B&W(B*$B&W(Bdx=

1
2$B&P(B

$B"i(B $B&P(B

$B!]&P(B 
(F1* e$B!](Bix+ F2* e$B!](B2ix+F3*e$B!](B3ix)(F1 eix+ F2 e2ix+F3e3ix)dx

(8.17)
$B$H$J$k!#(B

$B!!$3$3$G(Beinx(n $B!b(B 0)$B$N$h$&$J?6F04X?t$rHO0O!]&P(B < x < $B&P(B(n$B<~4|J,$KBP1~$9$k(B)$B$G@QJ,$9$k$H!"Ez$($O%<%m$K$J$k$3$H$r;W$$=P$=$&!#GH$N;3$HC+$rB-$7$F9T$/$3$H$K$J$k$+$i$G$"$k!#$3$l$r;H$&$H!"$+$1;;$N7k2L(Beix$B$,(B $B;D$k$h$&$J9`(B($B$?$H$($P(BF*1e$B!](Bix$B$H(BF2 e2ix$B$N(B $B@Q(B)$B$O$I$&$;%<%m$@$+$i7W;;$9$kI,MW$O$J$$!#$3$N$h$&$K0c$&1?F0NL$r;}$C$?GHF04X?t$N@Q$r@QJ,$9$k$H(B0$B$K$J$k(B($BF1$81?F0NL$r;}$D$b$N$I$&$7$N@Q$@$1$,;D(B $B$k(B)$B$N$O$9$08e$G3X$V0lHLE*$JK!B'!V(B$B%(%k%_!<%H$J1i;;;R$KBP$7$F0[$J$k8GM-CM$r;}$D8GM-4X?t$OD>8r$9$k(B$B!W(B($B!V%(%k%_!<%H!W$H$$$&8@MU$N0UL#(B $B$O$9$0$K=P$F$/$k(B)$B$N0lNc$G$"$k!#(B
$B!!$5$F0J>e$N$h$&$J9M;!$+$i!"(B


$B"i(B $B&P(B

$B!]&P(B 
$B&W(B*$B&W(Bdx =

1
2$B&P(B

$B"i(B $B&P(B

$B!]&P(B 
(F1* F1 + F2* F2+F3*F3) dx
=
F1* F1 + F2* F2+F3* F3

(8.18)
$B$J$N$G!"5,3J2=>r7o$+$i!"(BF1* F1 + F2* F2+F3* F3 = 1$B$G$J$/$F$O$J$i$J$$!#$3$N;~!"(BF1* F1,F2* F2,F3* F3$B$H$$$&(B3$B$D$N?t$O!"1?F0NL$,$=$l$>$l!"(Bhbar.png,2hbar.png,3hbar.png$B$K(B $B$J$k3NN($rI=$9!#$h$C$F!"$3$N>l9g$N1?F0NL$N4|BTCM$O(B($BCM(B)$B!_(B($B3NN((B)$B$NOB$H$7$F7W;;$7$F!"(B
< p > = hbar.png F1* F1 + 2hbar.png F2* F2 + 3hbar.png F3* F3
(8.19)
$B$H$$$&$3$H$K$J$k!#(B
$B!!$G$O!"1?F0NL$N4|BTCM$r7W;;$9$k$K$O!"$^$:GHF04X?t$r(B(8.13)$B$N$h$&$K%U!<%j%(5i?t$GE83+$7$F!"(B $B78?t(BFn$B$r5a$a$F$*$+$J$/$F$O$$$1$J$$$N$@$m$&$+!)(B5
$B!![$B"_(B/$B"_(Bx] $B$GCV$-49$($k$3$H$,$G$-$k!W$H$$$&$3$H$N$"$j$,$?$5$,$3$3$G$b=P$F$/$k!#GHF04X?t$K$3$N1i;;;R$r$+$1$k$H!"(B
$B!](Bihbar.png $B"_(B
$B"_(Bx
$B&W(B(x)= 1


$B"e(B

2$B&P(B

$B!J(B $B!](Bihbar.png $B"_(B
$B"_(Bx
) (F1 eix+ F2 e2ix+F3e3ix ) = 1


$B"e(B

2$B&P(B
(hbar.png F1 eix+ 2hbar.png F2 e2ix+3hbar.pngF3e3ix )
(8.20)
$B$H$J$k!#$D$^$j!"GHF04X?t$N3F@.J,$NA0$K!"$=$l$>$l$N@.J,$N;}$D1?F0NL$,$+$1;;$5$l$?7A$G=P$F$/$k!#$3$l$K&W(B*$B$r$+$1$F@QJ,$9$k(B $B$H!"$5$C$-$HF1$8M}M3$G(Beix$B$,;D$i$J$$ItJ,$@$1$,%N%s%<%m$G;D$k$+$i!"(B


$B"i(B $B&P(B

$B!]&P(B 
$B&W(B* $B!J(B $B!](Bihbar.png $B"_(B
$B"_(Bx
) $B&W(Bdx =

1
2$B&P(B

$B"i(B $B&P(B

$B!]&P(B 
(F1* e$B!](Bix+ F2* e$B!](B2ix+F3* e$B!](B3ix ) (hbar.pngF1 eix+ 2hbar.pngF2 e2ix+3 hbar.pngF3e3ix )
=
hbar.pngF1* F1 + 2hbar.png F2* F2 + 3hbar.pngF3* F3

(8.21)
$B$G$"$k!#$b$C$H0lHLE*$JGHF04X?t$G$"$C$F$bF1$8$3$H$,8@$($k!#$D$^$j!"(BFn $B$r7W;;$7$J$/$F$b!"(B
< p > = $B"i(B $B&W(B* $B!J(B $B!](Bihbar.png $B"_(B
$B"_(Bx
)
$B&W(Bdx
(8.22)
$B$H7W;;$9$l$P$h$$$N$G$"$k!#A0$K(B < x > $B$N7W;;$G$o$6$o$6(Bx$B$r&W(B*$B$H&W$N4V$KCV$$$?$N$O!"$3$N<0$HF1$87A$K$J$k(B $B$h$&$K$G$"$k!#!](Bihbar.png[$B"_(B/$B"_(Bx]$B$NJ}$OHyJ,1i;;;R$G$"$k$+$i$I$3$K$*$$$F$b$h$$$H$$$&$o$1$K$O$$(B $B$+$J$$!#(B



[$BLd$$(B8-1] $B!]&P(B < x < $B&P$GDj5A$5$l$?GHF04X?t$,&W(B = [1/$B"e(B{$B&P(B}]sinx$B$@$C(B $B$?$H$9$k!#$3$N>l9g$N(B < p > $B$r5a$a$h!#(B
[$BLd$$(B8-2] $BA0Ld$G$N(B < p > $B$NEz$($O!"7W;;$;$:$H$b!"(Bsinx=[1/2i](eix$B!](Be$B!](Bix) $B$H$$$&7A$r8+$l$P4JC1$K$o$+$k!#$I$N$h$&$K$o$+$k$N$+!)(B



$B!!(Beinx$B$H$$$&4X?t$O!](Bihbar.png[$B"_(B/$B"_(Bx]$B$r$+$1$k$H(B
$B!](Bihbar.png $B"_(B
$B"_(Bx
einx = hbar.pngn einx
(8.23)
$B$N$h$&$K!"(B hbar.pngn$B!_(B($B85$N4X?t(B)$B$H$$$&7A$K$b$I$k!#$D$^$j$3$N4X?t$O(Bp$B$N8GM-4X?t$G$"$j!"8G(B $BM-CM$O(Bhbar.png n$B$G$"$k(B6$B!#(B
$B>e$G$O#3uBV$NB-$79g$o$5$l$?>uBV$K$J$C$F$$$kGHF04X?t$r9M$($?!#$3$N$h$&$JGHF04X?t$O8GM-4X?t$G$O$J$$(B($B0l8D0l8D$N@.J,$O8GM-4X(B $B?t(B)$B!#GHF04X?t$,1?F0NL$N8GM-4X?t$K$J$C$F$$$k(B(einx$B0l9`$N$_$+$i$J$k(B)$B$H$$$&$3$H$O!"$=$NGHF04X?t$GI=$5$l$F$$$kNL;RNO3XE*(B $B>uBV$O1?F0NL$,0l$D$NCM(B(hbar.pngn)$B$K7h$^$C$F$$$F!"$f$i$.$,$J$$$H$$$&$3$H$G$"$k!#(B
$B!!$3$N;~!"&W(B*$B&W$r7W;;$9$k$H!"(Bx$B$K$h$i$J$$Dj?t$H$J$k!#$J$<$J$i$P!"(Be$B!](Binxeinx=1 $B$H$$$&7W;;$+$i(Bx$B$,>C$($F$7$^$&$+$i$G$"$k!#$D$^$j!"$3$N$h$&$JGHF04X?t$O3NN(L)EY$,Dj?t!"$9$J$o$A!"!V$I$3$K$$$k$s$@$+$5$C$Q$j$o$+$i$J$$!W$H$$$&$3$H(B $B$G$"$k!#1?F0NL$,3NDj$9$k$H0LCV$,IT3NDj$K$J$k$H$$$&IT3NDj@-4X78$,!"$3$3$G$b $B!!ikx$B$NOB$N7A$K$+$1$k$H$$$&$3$H$O$9$J$o$A!"G$0U$NGHF04X?t$,$$(B $B$m$s$J1?F0NL$r;}$C$?GHF04X?t$N=E$M9g$o$;$G$+$J$i$:=q$1$k$H$$$&$3$H$G$"$k!#(B

8.4  $B1i=,LdBj(B

[$B1i=,LdBj(B8-1] $B&W(B(x)=e3ix+eix$B$H$$$&GHF04X(B $B?t(B(x$B$NHO0O$O!]&P(B < x < $B&P(B)$B$r5,3J2=$7$?8e!"1?F0NL$N4|BTCM$r5a$a$h!#(B
[$B1i=,LdBj(B8-2]
$B0J2<$N$h$&$KI=$5$l$kGHF04X?t&W(B($B
[$B1i=,LdBj(B8-3] [$B1i=,LdBj(B7-3] $B$G7W;;$7$?GHF04X?t(B

  1. $B&W(B(x)=sin(x)

  2. $B&W(B(x)=einx (n$B$O@0?t(B)


  3. $B&W(B(x)
    =
    x     ( for  x ≥ 0)


    $B&W(B(x)
    =
    $B!](Bx   ( for  x < 0)

($BA4$F!"(Bx$B$O!]&P(B < x < $B&P$NHO0O$H$9$k(B)
$B$=$l$>$l$N>l9g$K$D$$$F(B < x > $B$r7W;;$7$F$_$h!#(B
[$B1i=,LdBj(B8-4] $B"i&W(B*(x,t)$B&W(B(x,t) dx$B$NCM$O;~4V$,7P$C$F$bJQ2=$7$J$$(B($B3NN($NJ]B8B'(B)$B$3$H$r!"(B $B%7%e%l!<%G%#%s%,!7)$B$r;H$C$F>ZL@$;$h!#$?$@$7!"&W(B(x,t)$B$*$h$S(B $B$=$NHyJ,$O1sJ}$G$O(B0$B$K$J$C$F$$$k$b$N$H$9$k!#(B
[$B1i=,LdBj(B8-5] $B"i(Bab $B&W(B*(x,t)$B&W(B(x,t)dx$B$N$h$&(B $B$K!"@QJ,HO0O$r0lItJ,(B(a < x < b) $B$K$9$k$H!"$3$NNL$O0lHL$KJ]B8$7$J$$!#$J$<$J$i!"(Bx=a$B$H(Bx=b$B$H$$$&C<$C$3$+(B $B$i!"N3;R$,F($2=P$7$F9T$/(B($B$"$k$$$O30$+$iN3;R$,F~$C$FMh$k(B)$B$+$i$G$"$k!#$3$N(B $B<0$rHyJ,$9$k$H(B

d
dt

$B"i(B
b

a 
$B&W(B*(x,t)$B&W(B(x,t)dx = [J(x,t) ]ab = J(a,t)$B!](BJ(b,t)
$B$N$+$?$A$KD>$9$3$H$,$G$-$k$,!"$3$N(B J(x,t)$B$O$9$J$o$A!"N3;R$NB8:_3NN($,@5J}8~$X$I$l$/$i$$N.$l$F9T$/$+$rI=$9NL$G$"$k!#&W(B(x,t)$B$,(B(7) $B$rK~$?$7$F$$$k>l9g$K$D$$$F!"(BJ(x,t)$B$r5a$a$h!#(B

Footnotes:

1$B@53N$K8@$&$H!V%7%e(B $B%l!<%G%#%s%,! 2$B!VI=LL9`!W$H$O!""i(Bab [df(x)/dx] dx=[f(x)]ba=f(a)$B!](Bf(b)$B$H$$$&7A$K=q$1$k<0$N$3$H!#(Bx=a$B$H(Bx =b$B$,@QJ,$NC<$C$3!J!aI=LL!K$J$N$G$3$&8F$V!#(B
3x$B$NHO0O$r(B($B!]!g(B, $B!g(B)$B$K$7$F$b!"$3$3$G9T$C$?$h$&$K(Beikx$B$N=E$M9g$o$;$GGHF04X?t$rI=$9$3$H$O2DG=$G$"$k!#$?$@$=$N>l9g!""i&W(B*$B&W(Bdx=1 $B$K$9$k$3$H$,Fq$7$/$J$k!#$3$l$K$D$$$F$O$^$?8e$G=R$Y$k!#(B
4$B!VGH?t!W$H$$$&8@MU(B $B$O8m2r$rinx$B$N(B $B>l9g!"5wN%(B2$B&P$KBP$7$F(B2$B&P(Bn$B0LAj$,JQ$o$k!#(B
5$B:#$N>l9g:G=i$+$iE8(B $B3+$5$l$F$$$k<0(B(8.16)$B$+$i;O$a$?$+$i$o$+$i$J$$$+$b$7$l$J$$$,!"0lHL$N4X?t$,=P$F$-(B $B$?;~$K$=$l$r(B(8.16)$B$N7A$KD>$9$N$O!"3Z$K$G$-$k$H$O8B$i$J$$!#(B
6$BNr;KE*;v>p$+$i!"1Q(B $B8l$NK\$G$b!"$3$l$i$N!V8GM-!W$O%I%$%D8l$G$"$k(Beigen($BH/2;$O2>L>=q$-$9$k$H%"%$%2%s(B) $B$r;H$&!#8GM-4X?t$O(Beigen function$B!"8GM-CM$O(Beigen value$B!#(B

$B3X@8$N46A[!&%3%a%s%H$+$i(B

  $B8EE5NO3X$N#x$H#p$rNL;RNO3X$KBP1~$5$;$k$K$O1i;;;R$N4|BTCM$r=P$5$J$/$F$O$$$1$J$$!&!&!&$H$3$m$^$G$O$o$+$j$^$7$?$,!"7W;;$OA4A33P$($i$l$=$&$K$"$j$^$;(B $B$s!#(B
$B!!3P$($kI,MW$O$J$$$G$7$g$&!#!V$3$&$$$&6ZF;$G=P$;$k!W$H$$$&$3$H$r$A$c$s(B $B$HM}2r$7$^$7$g$&!#:Y$+$$7W;;%F%/%K%C%/$r3P$($k$h$j!"$^$:$O6ZF;!#(B

$B!!<+J,$b@dBP$d$C$F$O$$$1$J$$4V0c$$!J??$sCf$N#x$rHyJ,$7$F(Bdx/dt$B!K$r$d$C$F$7$^$$$=$&$G(B $B$9!JJ#?t!K!#(B
$B!!$"$l$O$h$/$d$j$^$9!#$G$b!"!V<+J,$,$$$C$?$$2?$r7W;;$7$F$$$k$N$+!W$r$h(B $B$/9M$($F!"?5=E$K!#(B

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On 14 Jul 2006, 13:44.