allowed cross section 中文意思是什麼
allowed cross section
解釋
容許截面-
We consider two situations : ( i ) the light is polarized along the z - direction, in which case the first allowed dipole transition is to the first subband ( nx - 1, ny = 1 ) ; ( ii ) the light is polarized along the x - direction ( paralleled to the transverse cross - section of the wire ). the first allowed dipole transition is to the second subband nx = 2 relative to the x - direction and to the first subband nr = 1 relative to the y - direction of the wire
考慮了兩種不同惰況:輻射光沿階線的軸線偏振k方向x輻射光平行於軸截面偏振(設為二方向山偶極躍遷的選擇定則使得體系從初態躍遷到末態分別為電于的第一于帶和第二子帶,二名的光電離0截面隨光于能量的變化截然不同
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