Spectroscopic characterization of the ground and low-lying electronic states of Ga2N via anion photoelectron spectroscopy.

Citation data:

The Journal of chemical physics, ISSN: 0021-9606, Vol: 124, Issue: 6, Page: 64303

Publication Year:
2006
Usage 69
Abstract Views 32
Downloads 23
Full Text Views 14
Captures 4
Readers 3
Exports-Saves 1
Citations 21
Citation Indexes 21
Repository URL:
https://repository.usfca.edu/chem_fac/12
PMID:
16483203
DOI:
10.1063/1.2159492; 10.1063/1.2159492.; 10.1063/1.2159492. sheehan sm, meloni g, parsons bf, wehres n, neumark dm. spectroscopic characterization of the ground and low-lying electronic states of ga2n via anion photoelectron spectroscopy. j chem phys. 2006 feb
Author(s):
Sheehan, Sean M; Meloni, Giovanni; Parsons, Bradley F; Wehres, Nadine; Neumark, Daniel M
Publisher(s):
AIP Publishing
Tags:
Physics and Astronomy; Chemistry
article description
Anion photoelectron spectra of Ga(2)N(-) were measured at photodetachment wavelengths of 416 nm(2.978 eV), 355 nm(3.493 eV), and 266 nm(4.661 eV). Both field-free time-of-flight and velocity-map imaging methods were used to collect the data. The field-free time-of-flight data provided better resolution of the features, while the velocity-map-imaging data provided more accurate anisotropy parameters for the peaks. Transitions from the ground electronic state of the anion to two electronic states of the neutral were observed and analyzed with the aid of electronic structure calculations and Franck-Condon simulations. The ground-state band was assigned to a transition between linear ground states of Ga(2)N(-)(X (1)Sigma(g) (+)) and Ga(2)N(X (2)Sigma(u) (+)), yielding the electron affinity of Ga(2)N, 2.506+/-0.008 eV. Vibrationally resolved features in the ground-state band were assigned to symmetric and antisymmetric stretch modes of Ga(2)N, with the latter allowed by vibronic coupling to an excited electronic state. The energy of the observed excited neutral state agrees with that calculated for the A (2)Pi(u) state, but the congested nature of this band in the photoelectron spectrum is more consistent with a transition to a bent neutral state.