Photodissociation spectroscopy and dynamics of the N{sub 2}O{sup {minus}}{sub 2} anion

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.471132· OSTI ID:279731

Osborn, D L; Leahy, D J; Cyr, D R; Neumark, D M ^[1]

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1. Department of Chemistry, University of California, Berkeley, California, 94720 (United States)

The spectroscopy and dissociation dynamics of the N{sub 2}O{sup {minus}}{sub 2}(C{sub 2{ital v}}) anion have been investigated using the technique of fast ion beam translational spectroscopy. A newly developed pulsed supersonic discharge source is described for the production of internally cold N{sub 2}O{sup {minus}}{sub 2}. A structured absorption band beginning near 580 nm is observed, and is assigned to the {tilde {ital B}}({sup 2}{ital A}{sub 2}){l_arrow}{tilde {ital X}}({sup 2}{ital B}{sub 2}) transition with the aid of {ital ab} {ital initio} calculations. Two dissociation channels from the upper state are observed: (1) O{sup {minus}}+N{sub 2}O and (2) NO{sup {minus}}+NO. Translational energy and angular distributions are measured for both channels at several excitation energies. The translational energy distribution for channel (1) at 570 nm shows resolved structure corresponding to N{sub 2}O vibrational excitation. The translational energy distributions for channel (1) are reasonably well described by prior distributions, indicating this channel results from dissociation from the N{sub 2}O{sup {minus}}{sub 2} ground electronic state. In contrast, channel (2) appears to result from dissociation on a repulsive excited electronic state. From the translational energy distributions for channel (1), we obtain the bond dissociation energy and heat of formation (at 0 K) for N{sub 2}O{sup {minus}}{sub 2}: {ital D}{sub 0}(O{endash}N{sub 2}O)=1.40{plus_minus}0.03 eV and {Delta}{ital H}{sup 0}{sub {ital f},0}(N{sub 2}O{sup {minus}}{sub 2})=0.58{plus_minus}0.04 eV. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 279731
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 13 Vol. 104; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AB INITIO CALCULATIONS
ABSORPTION
ANGULAR DISTRIBUTION
ANIONS
DISSOCIATION
DISSOCIATION ENERGY
EXCITED STATES
GROUND STATES
ION BEAMS
NITROGEN OXIDES
SPECTROSCOPY