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Title: Far ultraviolet absorption spectra of N{sub 3} and N{sub 2}{sup +} generated by electrons impacting gaseous N{sub 2}

Electron bombardment of gaseous N{sub 2} produces N{sub 2} {sup +} and N{sub 3}, which are subsequently trapped in the N{sub 2} matrix at 10 K. Both the infrared and ultraviolet absorption spectra of the matrix sample at various stages of electron irradiation were recorded. Apart from a progression observed below 192 nm, with intervals ∼900 cm{sup –1}, corresponding to the transition of D {sup 2} Π {sub g} ← X {sup 2} Σ {sub g} {sup +} of N{sub 2} {sup +}, three new progressions were recorded in the range 225-192 nm, with intervals ∼1000 cm{sup –1}, that correlated well with variations in intensities of the electronic absorption band of N{sub 3} at 272.7 nm; an absorption coefficient of 3.76 × 10{sup –17} cm molecule{sup –1} for the transition A {sup 2}Σ{sub u} {sup +}← X {sup 2}Π{sub g} of N{sub 3} was estimated for the first time. These newly observed progressions were characterized and the vertical excitation energy and oscillator strength were calculated using time-dependent, density-functional theory. This was based on assigning the three progressions to electronic transitions of N{sub 3} from the ground state to 2 {sup 2}Π{sub u}, 1 {sup 2}Σ{sub g} {sup +}, and 1more » {sup 2}Σ{sub g} {sup –}, respectively.« less
Authors:
; ;  [1] ;  [2]
  1. National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan (China)
  2. Department of Medical and Applied Chemistry, Kaohsiung Medical University, 100, Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan (China)
Publication Date:
OSTI Identifier:
22348510
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 779; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; ABSORPTION SPECTRA; DENSITY FUNCTIONAL METHOD; ELECTRON BEAMS; ELECTRONS; EXCITATION; FAR ULTRAVIOLET RADIATION; GROUND STATES; MOLECULAR IONS; MOLECULES; NITROGEN; OSCILLATOR STRENGTHS; PLANETS; SATELLITE ATMOSPHERES; TIME DEPENDENCE