【摘要】 (1)日晕光谱线之来源,至今为未决定之问题。Goudsmit与吴大猷曾假设诸谱线乃由氦气双激起原子所生。过去有人企图用实验方法得到双激起氦原子之光谱,未能成功。但有数种实验室内现象,均有人用此假设以解释之。故作者希望在适当情形下得到双激起氦原子之光谱。 （2）由理论上知用电子撞击法造成双激起之可能性甚小,但此可能性之最大值在电子能为300至600electron volts时故作者企图在人为的此种情形下观察双激起氦原子光谱,但结果未能发现。 （3）此种实验结果可从理论方面予以解释。作者由双激起2s3s³S状态之计算,知其谱线之宽约为1000cm^-1,故实验时不能观察因此以前关於日晕光谱之解释,亦成疑问。更多还原

【Abstract】 An attempt to observe the spectrum of doubly excited helium by excitation by electron impact, with energies between 500-600 electron volts, is made without success. This and other failures are discussed by considering of the life times of the doubly excited states. An approximate calculation gives for 2s3s3S a life time of the order 10-15 sec, corresponding to a natural width of the level of the order 1000 cm-1. While this accounts for the absence of a line spectrum of doubly excited helium, it renders the former suggestion that the corona lines may be due to it untenable.更多还原