Electronic control of the spin–orbit branching ratio in the photodissociation and predissociation of HCl

Liyanage, Rohana; Yang, Yung-an; Hashimoto, Satoshi; Gordon, Robert J.; Field, Robert W.
October 1995
Journal of Chemical Physics;10/15/1995, Vol. 103 Issue 15, p6811
Academic Journal
The fine structure branching ratio of chlorine atoms produced in the photodissociation and predissociation of HCl was measured for excitation energies between 51 800 and 83 800 cm-1. The branching ratio between 60 000 and 70 000 cm-1 is in good agreement with the calculations of Alexander et al. [J. Chem. Phys. 99, 1752 (1993)], converging to the statistical limit at high energy. Predissociation of electronically excited bound states display a surprisingly rich behavior, demonstrating that the nature of the predissociating continuum state has a large effect on the atom fragment branching ratio. © 1995 American Institute of Physics.


Related Articles

  • Photodissociation of HCl at 193.3 nm: Spin-orbit branching ratio. Zhang, J.; Dulligan, M.; Wittig, C. // Journal of Chemical Physics;8/1/1997, Vol. 107 Issue 5, p1403 

    Focuses on the results of the photodissociation of hydrogen chloride (HCl) using ultraviolet radiation. Time-of-flight spectra of the hydrogen atom fragment; Spin-orbit state distribution of the chlorine fragment; Study of hydrogen atom angular distribution by changing the ultraviolet photolysis.

  • Effects of asymptotic interactions on the photodissociation of HCl. Lee, Sungyul; Jung, Kyung-Hoon // Journal of Chemical Physics;2/8/2000, Vol. 112 Issue 6 

    Theoretical analysis is presented on the influence of the interactions among the asymptotically degenerate states correlating with Cl ([sup 2]P) on the photodissociation of HCl. The spin-orbit branching ratios of Cl([sup 2]P[sub j], j=1/2, 3/2) are computed for low photon energy (50 000-110 000...

  • Photodissociation of hydrogen chloride at 157 and 193 nm: Angular distributions of hydrogen atoms and fine-structure branching ratios of chlorine atoms in the 2Pj levels. Tonokura, Kenichi; Matsumi, Yutaka; Kawasaki, Masahiro; Tasaki, Shintaro; Bersohn, Richard // Journal of Chemical Physics;12/1/1992, Vol. 97 Issue 11, p8210 

    The H, D, and Cl atoms from the photodissociation of HCl and DCl at 157 and 193 nm were detected by laser-induced fluorescence (LIF) in the vacuum ultraviolet region. The Doppler profiles of the H and D resonance lines at 121.6 nm in the LIF spectra indicate that the absorption of HCl and DCl at...

  • Photodissociation of HCl adsorbed on the surface of an Ar[sub 12] cluster: Nonadiabatic molecular... Niv, Masha Y.; Krylov, Anna I.; Gerber, R. Benny; Buck, Udo // Journal of Chemical Physics;6/8/1999, Vol. 110 Issue 22, p11047 

    Studies the photodissociation of hydrogen chloride adsorbed on the surface of an argon cluster by semiclassical molecular dynamics simulations, using a surface-hopping approach for the nonadiabatic transitions. System, interactions and simulation method; Electronic transitions and...

  • Photodissociation of hydrogen chloride and hydrogen bromide. Matsumi, Yutaka; Tonokura, Kenichi; Kawasaki, Masahiro; Ibuki, Toshio // Journal of Chemical Physics;12/1/1990, Vol. 93 Issue 11, p7981 

    The Doppler profiles of the hydrogen atom photofragments from the photodissociation of HCl and HBr at 157 and 243 nm are observed to determine the symmetries of the photoexcited states by using a resonance enhanced multiphoton ionization technique. The phototransitions are perpendicular for HCl...

  • Quantum state distributions of HCl from the ultraviolet photodissociation of HCl dimer. Picconatto, Carl A.; Ni, Hong; Srivastava, Abneesh; Valentini, James J. // Journal of Chemical Physics;4/22/2001, Vol. 114 Issue 16 

    The rovibrational state distributions for the HCl product of the 193 nm photodissociation of (HCl)[sub 2], (HCl)[sub 2]+hν→H+Cl+HCl, have been measured. The HCl dimer is prepared in a supersonic expansion of HCl in Ar, and its photoproduct detected by resonant multiphoton ionization...

  • Photodissociation dynamics of OClO. Davis, H. Floyd; Lee, Yuan T. // Journal of Chemical Physics;11/8/1996, Vol. 105 Issue 18, p8142 

    Photofragment translational energy spectroscopy was used to study the dissociation dynamics of a range of electronically excited OClO(A 2A2) vibrational states. For all levels studied, corresponding to OClO(A 2A2←X 2B1) excitation wavelengths between 350 and 475 nm, the dominant product...

  • Ab initio studies on the electronic excited states and photodissociation of O[sub 3] anion. Qiang Cui; Morokuma, Keiji // Journal of Chemical Physics;5/8/1998, Vol. 108 Issue 18, p7684 

    Calculates the low-lying electronic states of ozone to clarify the mechanism of processes in photodissociation. Identity of the mysterious state implied in the Continetti experiment; Result of the meta-intrinsic reaction coordinate calculations; Need of dynamic calculations for the exact effect...

  • Propensities toward C2H(A 2Π) in acetylene photodissociation. Zhang, J.; Riehn, C. W.; Dulligan, M.; Wittig, C. // Journal of Chemical Physics;10/15/1995, Vol. 103 Issue 15, p6815 

    When expansion-cooled acetylene is excited to the ν″1+3ν″3 vibrational level (4 quanta of CH-stretch) and then photodissociated at 248.3 nm, the dominant product channel is C2H(A 2Π). This differs markedly from one-photon 193.3 nm photodissociation, which provides 1200 cm-1...


Read the Article


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

Try another library?
Sign out of this library

Other Topics