MICROWAVE OPTICAL MAGNETIC RESONANCE INDUCED BY ELECTRONS (MOMRIE) IN EXCITED $H_{2}$

Author Institution: Bell Telephone Laboratories, Inc.A new form of molecular spectroscopy has been developed which may be called Microwave Optical Magnetic Resonance Induced by Electrons (MOMRIE). Electron bombardment is used to excite molecules residing in a microwave cavity in a magnetic field. Light emitted from the excited electronic states is monitored in a direction perpendicular to the field and the colinear exciting electron beam. The magnetic field is swept to tune the molecular levels to resonance with the microwave frequency. This resonance condition is observed via a change in the polarization and/or intensity of the emitted light. The MOMRIE technique was first tested by measurements of the fine structure and diamagnetic Zeeman effect in the 4p $^{3} P$ and 5p $^{3} P$ states of He. This work has now been extended to molecular $H_{2}$. When light emitted from the v=0, K = 1 level of the 3d state of $H_{2}$ is observed, a MOMRIE line is detected at 7383.0 gauss with an apparent width of 19.1 gauss. From the X-band microwave frequency, one can calculate an effective g value of 0.8907$_{8}$, close to that expected for this level (because of L-uncoupling). Besides this MOMRIE line, eight other strong lines have been detected in the region between 9.5 and 10.2 Kg. These latter lines do not require microwave radiation and presumedly correspond to the crossing or anticrossing of molecular levels