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Title: Collision induced ultraviolet structure in nitrogen radar REMPI spectra

We present 2 + 2 radar REMPI measurements in molecular nitrogen under atmospheric conditions and observe a strong interference in the (1,0) vibrational band of the a{sup 1}Π{sub g} ← X{sup 1}Σ{sub g}{sup +} electronic manifold. The interference is suppressed by using circularly polarized light, permitting rotational analysis of the 2 + 2 radar REMPI spectrum. It is observed in pure nitrogen, though the structure varies with gas composition. The structure also varies with temperature and pressure. These results indicate that it is collision induced. We hypothesize that the source of the interference is a 3 + 1 REMPI process through the a{sup ″1}Σ{sub g}{sup +} electronic state.
Authors:
;  [1]
  1. Mechanical and Aerospace Engineering Department, Princeton University, Princeton, New Jersey 08544 (United States)
Publication Date:
OSTI Identifier:
22415416
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ELECTRONIC STRUCTURE; INTERFERENCE; MOLECULES; NITROGEN; PRESSURE DEPENDENCE; RADAR; TEMPERATURE DEPENDENCE; ULTRAVIOLET RADIATION; VIBRATIONAL STATES; VISIBLE RADIATION