High Resolution VUV Spectroscopy of Electron Impact Induced Emissions from Molecular Nitrogen

Details High Resolution VUV Spectroscopy of Electron Impact Induced Emissions from Molecular Nitrogen High Resolution VUV Spectroscopy of Electron Impact Induced Emissions from Molecular Nitrogen

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13b0278m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA13B-0278

Physics

2400 Ionosphere (6929), 7549 Ultraviolet Emissions, 9800 General Or Miscellaneous

Scientific paper

Emissions in the VUV have been probed for transitions from the Rydberg states (c4^{'} ^{1}Σu+ and b^{'} ^{1}Σu+) to the ground state (X ^{1}Σg+) in molecular nitrogen. The experimental setup consists of a 3m spectrometer and an electron collision chamber. The electron beam (with energy spread of ~0.5eV) was magnetically collimated with an axially symmetric magnetic field of ~100G and accelerated to a given kinetic energy. A Faraday cup was used to monitor the beam current and to minimize the back-scattered electrons. Photons emitted by electron impact excited target molecules (i.e., N2 and H2) were dispersed by the spectrometer and detected at the rotationally-resolved level with a channel electron multiplier coated with CsI. Measured c4^{'} ^{1}Σu+ → X ^{1}Σg+ transition moment and predissociation yield of the c4^{'}(v^{'}=0) will be presented.
Acknowledgement: This work was carried out at JPL, Caltech, and SET under contracts with NASA and NSF. This research was performed while CPM held a NASA Postdoctoral Fellowship at JPL.

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