Abstract
An examination of the intensity contours of three second positive nitrogen bands excited by electrons of 14, 15, 16 and 18 electron volts energy, indicates that the contours change in shape as the energy of the exciting electrons is varied. These results and their relation to those of other investigators can be understood if there is a definite probability that an impinging electron will excite the electronic configuration of a molecule and then interact with the rotation before escaping from the molecular field. As might be expected, this probability is appreciable only when the energy of the exciting electron is nearly equal to the excitation energy.
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