TITLE

Photoproduction and dynamics of oxygen atoms in xenon matrices

AUTHOR(S)
Ryan, E. Todd; Weitz, Eric
PUB. DATE
July 1993
SOURCE
Journal of Chemical Physics;7/15/1993, Vol. 99 Issue 2, p1004
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The photodissociation of N2O doped in Xe matrices and the subsequent dynamics of atomic oxygen production have been studied. The O atom concentration is monitored via the laser-induced fluorescence of XeO exciplexes produced by the 193 nm excitation of Xe/O pairs. The O atom photoproduction cross section for 193 nm irradiation of N2O is 6.4±1.0×10-20 cm2 at 27 K, comparable to the gas phase value of 1.1×10-19 cm2. Dissociation of XeO exciplexes generates kinetically hot O atoms which are mobile. This photoinduced mobility can lead to O atom loss by recombination. The extent of O atom production as a function of laser irradiation is governed by a competition between the rates of photoproduction and photoinduced loss. The effects of temperature, concentration, and laser fluence on the production of O atoms are considered. The efficiency of photoinduced O atom loss increases significantly with increasing temperature. An ultraviolet absorption spectrum of XeO has been obtained with an absorption cross section of 1.9±0.4×10-16 cm2 at 248 nm.
ACCESSION #
7639736

 

Related Articles

  • Products and yields from O3 photodissociation at 1576 Ã…. Taherian, M. R.; Slanger, T. G. // Journal of Chemical Physics;12/15/1985, Vol. 83 Issue 12, p6246 

    An analysis has been made of the primary atomic and molecular products arising from O3 photodissociation at 1576 Å. The yield of oxygen atoms is 1.90±0.30, of which 71% are O(3P) and 29% are O(1D). Since a primary yield greater than unity can only be a consequence of three-fragment...

  • Vector properties of O([sub 3]P) and O(sup 1]D) in OH photodissociation: Near-threshold... Lee, Sungyul // Journal of Chemical Physics;10/8/1999, Vol. 111 Issue 14, p6407 

    Studies the vector properties of the oxygen atom produced from the photodissociation of oxygen hydrogen. Theory and computational methods; Potential curves of the electronic states; Isolated Lorentzian resonances corresponding to specific final total angular momentum quantum numbers; Influence...

  • Photodepletion and dynamics of oxygen atoms in xenon matrices. Ryan, E. Todd; Weitz, Eric // Journal of Chemical Physics;12/1/1993, Vol. 99 Issue 11, p8628 

    The photodepletion and reaction dynamics of O atoms isolated in xenon matrices have been studied. Oxygen atoms are generated by 193 nm photolysis of a N2O dopant and monitored via the laser-induced fluorescence of XeO exciplexes produced by the 248 nm excitation of Xe/O pairs. Dissociative...

  • Photodissociation of O[sub 2] via the Herzberg continuum: Measurements of O-atom alignment and orientation. Alexander, Andrew J.; Kim, Zee Hwan; Zare, Richard N. // Journal of Chemical Physics;6/15/2003, Vol. 118 Issue 23, p10566 

    Irradiation of molecular oxygen O[sub 2] in the region of the Herzberg continuum between 218 nm and 239 nm results in the production of open-shell photofragments O([sup 3]P)+O([sup 3]P). Product O([sup 3]P[sub j]; j=0,1,2) atoms were ionized using resonantly enhanced multiphoton ionization (2+1...

  • Nonresonant photofragmentation/ionization dynamics of O[sub 2] using picosecond and femtosecond laser pulses at 248 nm. Bakker, Bernard L. G.; Bakker, Bernard L.G.; Parker, David H.; Samartzis, Peter C.; Kitsopoulos, Theofanis N. // Journal of Chemical Physics;4/1/2000, Vol. 112 Issue 13 

    Photodissociation/ionization of molecular oxygen in a cold molecular beam is studied using a short-pulse laser beam at 248 nm and velocity map imaging. Both photoelectron and O[sup +] images are recorded for laser pulsewidths of 5 and 0.5 ps. Most of the observed ionization dynamics takes place...

  • Formation of HXeO in a xenon matrix: Indirect evidence of production, trapping, and mobility of XeO (1 1Σ+) in solid Xe. Kiviniemi, Tiina; Pettersson, Mika; Khriachtchev, Leonid; Räsänen, Markku; Runeberg, Nino // Journal of Chemical Physics;7/22/2004, Vol. 121 Issue 4, p1839 

    IR spectroscopy, laser induced fluorescence (LIF), and thermoluminescence (TL) measurements have been combined to monitor trapping, thermal mobility, and reactions of oxygen atoms in solid xenon. HXeO and O3 have been used as IR active species that probe the reactions of oxygen atoms. N2O and...

  • O(3P) atom lifetimes and mobilities in xenon matrices. Krueger, Herman; Weitz, Eric // Journal of Chemical Physics;2/15/1992, Vol. 96 Issue 4, p2846 

    The concentration of O atoms in xenon matrices at 32 and 40 K is followed by monitoring 736 nm emission from XeO* excimers. Emission is induced by excitation of O atom Xe pairs with 193 or 248 nm radiation. O atoms are initially produced via UV photolysis of N2O. At 32 K, approximately 50% of...

  • Detection of O([sup 1]D) produced in the photodissociation of O[sub 2]. I. Identification of the [sup 3]Σ[sub u][sup -] and [sup 3]Π[sub u] Rydberg states in 113-130 nm. Lee, P. C.; Nee, J. B. // Journal of Chemical Physics;1/22/2000, Vol. 112 Issue 4 

    The metastable O([sup 1]D) atom produced in the photodissociation of O[sub 2] in the wavelength region 113-130 nm was detected by measuring the 762 nm fluorescence of the transition O[sub 2](b [sup 1]Σ[sub g][sup +]→X [sup 3]Σ[sub g][sup -]). The excited states of O[sub 2] were...

  • The O([sup 1]D) yield from O[sub 2] photodissociation near H Lyman-alpha (121.6 nm). Lacoursiere, J.; Meyer, S.A.; Faris, G.W.; Slanger, T.G.; Lewis, B.R.; Gibson, S.T. // Journal of Chemical Physics;1/22/1999, Vol. 110 Issue 4, p1949 

    Studies the O([sup 1]D) yield from O[sub 2] photodissociation near H Lyman-alpha line. O([sup 1]D)+O[sub 2] collisional energy transfer; VUV laser light generation; Fluorescence detection; Data acquisition and analysis; Measurement of O([sup 1]D) quantum yields; Model implementation.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics