[1.21]已知封闭的圆环中粒子的能级为-|||-E =dfrac ({n)^2(h)^2}(8{pi )^2m(R)^2} .n=0 ,pm 1 ,pm 2 ,pm 3 ,...-|||-式中n为量子数,R是圆环的半径。若将此能级公式近似地用于苯分子中的π6^6离域π键,取-|||-=140pm ,试求其电子从基态跃迁到第一激发态所吸收的光的波长。
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