Far ultraviolet absorption spectra of N{sub 3} and N{sub 2}{sup +} generated by electrons impacting gaseous N{sub 2}
- National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan (China)
- Department of Medical and Applied Chemistry, Kaohsiung Medical University, 100, Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan (China)
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 1 {sup 2}Σ{sub g} {sup –}, respectively.
- OSTI ID:
- 22348510
- Journal Information:
- Astrophysical Journal, Vol. 779, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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