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Ultraviolet photoelectron spectrum of NO/sub 2//sup -/

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100330a017· OSTI ID:6187926
The 351.1-nm (3.532-eV) photoelectron spectrum of the nitrite anion (NO/sub 2//sup -/) is reported. The electron affinity of NO/sub 2/ is found to be 2.273 /plus minus/ 0.005 eV, which leads to the heat of formation ..delta../sub f/H/sub 0//degrees/(NO/sub 2//sup -/) = /minus/183.4 /plus minus/ 0.9 kJ/mol (/minus/43.8 /plus minus/ 0.2 kcal/mol). Vibrational progressions of the symmetric stretch and bending modes of nitrogen dioxide, NO/sub 2/(/anti/X/sup 2/A/sub 1/), are observed up to 8000 cm/sup -1/ above the ground state. Observed fundamental vibrational frequencies of NO/sub 2//sup -/ are v/sub 1/ = 1284 /plus minus/ 30 cm/sup -1/ (symmetric stretch) and v/sub 2/ = 776 /plus minus/ 30 cm/sup -1/ (bend). The vibrational band intensities are modeled by using a Franck-Condon analysis which explicitly treats the Duschinsky rotation of the normal coordinates between the anion and the neutral molecule. This analysis provides an estimate of the equilibrium geometry of the anion: r/sub c/(N-O) = 1.25 /plus minus/ 0.02 /Angstrom/ and ..cap alpha../sub c/(O-N-O) = 117.5 /plus minus/ 2/degrees//
Research Organization:
Univ. of Colorado, Boulder (USA)
OSTI ID:
6187926
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:19; ISSN JPCHA
Country of Publication:
United States
Language:
English