TITLE

Hyperfine quantum beats in the 209 nm fluorescence excitation spectrum of cyanogen

AUTHOR(S)
Hemmi, Naoki; Cool, Terrill A.
PUB. DATE
November 1996
SOURCE
Journal of Chemical Physics;11/8/1996, Vol. 105 Issue 18, p7964
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Singlet–singlet, singlet–triplet, and polarization hyperfine fluorescence quantum beats are observed following 209 nm excitation of the 1141 vibronic level of the A(1Σ-u) S1 singlet state. Singlet–singlet quantum beats arise from S1–S0 vibronic coupling to states of the S0 manifold lying above the dissociation limit, but isolated from the dissociative continuum by a high barrier to predissociation. Measurements of fluorescence lifetimes and quantum beat spectral widths set an upper bound on this predissociation rate of approximately 106 s-1. The singlet–singlet quantum beats for the N=9 rotational state provide the first example of quantum beats arising from superposition states from two separate (I=0 and I=2) nuclear spin states. Singlet–triplet quantum beats for N=12 exhibit magnetically induced modulations that provide further support for a theoretical model previously used to describe similar modulations for the N=8, 12, and 18 rotational states of the 41 vibronic level excited at 219 nm. Analysis of hyperfine polarization beats, associated with the reversible interchange of molecular polarization and nuclear spin polarization, yields results in satisfactory agreement with the predictions of the perturbation theory formulation of Fano and Macek. © 1996 American Institute of Physics.
ACCESSION #
7624940

 

Related Articles

  • Hyperfine polarization quantum beats in cyanogen. Cool, Terrill A.; Hemmi, Naoki // Journal of Chemical Physics;9/1/1995, Vol. 103 Issue 9, p3357 

    Hyperfine polarization quantum beats caused by the reversible interchange of molecular polarization and nuclear spin polarization are observed in the fluorescence of C2N2, following laser absorption on the 410A(1Σ-u)←X(1Σ+g) band at 219 nm. Cross sections for collisional quenching...

  • The equilibrium geometry and spectroscopic constants of cyanogen calculated by the single, double, and perturbative triple excitation coupled-cluster method. Botschwina, Peter // Journal of Chemical Physics;10/15/1993, Vol. 99 Issue 8, p6217 

    The equilibrium geometry and several spectroscopic constants of cyanogen (NCCN) have been calculated by coupled-cluster theory with single and double excitations using a large basis set of 220 contracted Gaussian-type orbitals and correlating all electrons. The results are in excellent agreement...

  • Erratum: Hyperfine polarization quantum beats in cyanogen [J. Chem. Phys. 103, 3357 (1995)]. Cool, Terrill A.; Hemmi, Naoki // Journal of Chemical Physics;5/8/1996, Vol. 104 Issue 18, p7366 

    Comments on a study which examined the polarization quantum beats in cyanogen, published in the 1995 issue of the 'Journal of Chemical Physics.'

  • Quantum beats in cyanogen from singlet/singlet and singlet/triplet superposition states. Hemmi, Naoki; Cool, Terrill A. // Journal of Chemical Physics;4/15/1996, Vol. 104 Issue 15, p5721 

    Fluorescence quantum beats, observed among hyperfine substates of the N=8, 10, 15, 18, 19, 22, and 38 rotational levels of the 41 A(1Σ-u) state of C2N2, are discussed. The Zeeman splittings of some beats, for N=8, 19, and 22, are too small to arise from the spin–orbit coupling of a...

  • Hyperfine structure and lifetime of the C 2Σ+, v=0 state of CH. Ubachs, Wim; Meyer, Gerard; ter Meulen, J. J.; Dymanus, A. // Journal of Chemical Physics;3/15/1986, Vol. 84 Issue 6, p3032 

    From a laser induced fluorescence (LIF) experiment on a molecular beam of CH, we have obtained the b and c hyperfine constants, the γ and γD spin-rotation constants as well as accurate values for the rotational constants B, D, and H for the C 2Σ+, v=0 state. From measurements of the...

  • Dispersed fluorescence spectroscopy of the GeCl2 ÖX transition. Yu-Shu Lin; Cheng-Chung Chen; Bor-Chen Chang // Journal of Chemical Physics;6/14/2006, Vol. 124 Issue 22, p224322 

    The laser-induced fluorescence excitation spectrum of the GeCl2 ÖX transition at ultraviolet wavelengths (300–320 nm) was recorded in a direct current discharge supersonic free jet expansion. The excitation spectrum contains several sharp peaks and a congested diffuse...

  • Steering population flow in coherently driven lossy quantum ladders. Yatsenko, Leonid P.; Rangelov, Andon A.; Vitanov, Nikolay V.; Shore, Bruce W. // Journal of Chemical Physics;7/7/2006, Vol. 125 Issue 1, p014302 

    We present a detailed theory of a technique for the adiabatic control of the population flow through a preselected decaying excited level in a three-level ladder quantum system, as was experimentally demonstrated recently by Garcia-Fernandez et al. [Phys. Rev. Lett. 95, 043001 (2005)]....

  • Theory of carrier motion in dynamically disordered systems. Loring, Roger F.; Sparpaglione, Massimo; Mukamel, Shaul // Journal of Chemical Physics;2/15/1987, Vol. 86 Issue 4, p2249 

    We present a quantum mechanical theory of the dynamics of a charge carrier or an electronic excitation in a condensed phase system, in which the solvent degrees of freedom that couple to the electronic excitation are characterized by a correlation time of arbitrary magnitude. We consider a...

  • A reduced dimensionality quantum reactive scattering study of the insertion reaction O(1D)+H2→OH+H. Badenhoop, Jay K.; Koizumi, Hiroyasu; Schatz, George C. // Journal of Chemical Physics;7/1/1989, Vol. 91 Issue 1, p142 

    This paper presents a two degree of freedom model for describing the quantum dynamics of the insertion reaction O(1 D) + H2 in which bend motions are treated with a sudden approximation. Comparison of product state vibrational distributions from a classical version of this model with three...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics