Photoelectron spectroscopy of HNO/sup -/ and DNO/sup -/

Journal Article · Wed Jun 01 04:00:00 EDT 1983 · J. Chem. Phys.; (United States)

OSTI ID:6301956

Ellis, Jr, H B; Ellison, G B

We have obtained the photoelectron spectra of HNO/sup -/ and DNO/sup -/ using a recently constructed negative ion photoelectron spectrometer. We observe detachment to three different electronic states of HNO and DNO, namely the X /sup 1/A', a /sup 3/A'', and A /sup 1/A'' states. The electron affinity of HNO is determined to be 0.338 +- 0.015 eV while that of DNO is 0.330 +- 0.015 eV. The a /sup 3/A'' state, which has not been observed directly before, is found to lie 0.778 +- 0.020 eV above the X /sup 1/A' state in HNO and 0.785 +- 0.020 eV in DNO. We see vibrational excitation up to ..nu..'/sub 2/ = 3 of the ..nu../sub 2/ (N--O stretch) mode in the HNO and DNO X /sup 1/A' state. In the a /sup 3/A'' and A/sup 1/ A'' states, we see excitation of both ..nu../sub 2/ and ..nu../sub 3/ (H--N--O bend) modes. The fundamental frequencies for the a /sup 3/A'' state are ..nu../sub 2/ = 1468 +- 140 cm/sup -1/ and ..nu../sub 3/ = 992 +- 150 cm/sup -1/ for HNO and ..nu../sub 2/ = 1452 +- 140 cm/sup -1/ and ..nu../sub 3/ = 750 +- 140 cm/sup -1/ for DNO. Analysis of transitions from vibrationally excited ions gives a ..nu../sub 2/ fundamental frequency of 1153 +- 170 cm/sup -1/ in HNO/sup -/ and 1113 +- 170 cm/sup -1/ in DNO/sup -/. A study of the angular distribution of the photodetached electrons yields the values of ..beta.., the anisotropy parameter, for the various transitions in the spectrum. A Franck--Condon factor analysis of the HNO X /sup 1/A' band results in an estimate of the N--O bond length in the negative ion of 1.33 +- 0.02 A.

• Research Organization: Department of Chemistry, University of Colorado, Boulder, Colorado 80309
• OSTI ID: 6301956
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640300* -- Atomic
Molecular & Chemical Physics
74 ATOMIC AND MOLECULAR PHYSICS
AFFINITY
ANIONS
CHARGED PARTICLES
ELECTRON SPECTROSCOPY
ELECTRONEGATIVITY
ELECTRONIC STRUCTURE
FRANCK-CONDON PRINCIPLE
HYDROGEN COMPOUNDS
IONS
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
SPECTROSCOPY