Photodissociation into H(1S) + H(n = 2) atoms: Total and partial dissociation cross sections and relative importance of dissociation and predissociation

Journal Article · Wed Jan 01 04:00:00 EST 1986 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.33.346· OSTI ID:6280852

Glass-Maujean, M; Guyon, P M; Breton, J

The total cross section for the photodissociation of H2 into H(1S) + H(n = 2) between 85.0 and 77.0 nm has been measured using synchrotron radiation at high resolution (0.005-nm bandwidth). This continuum is made up of three contributions from B, B' /sub u/ , and C Pi/sub u/. The B' photodissociation cross section is obtained directly at some excitation wavelengths from analysis of predissociation Fano profiles. The data are compared to computed values. The contribution of predissociated levels to the production of H(n = 2) + H(1S) atoms for white-light excitation is found to be more than two times more efficient than the direct photodissociation.

• Research Organization: Laboratoire pour l'Utilisation du Rayonnement Electromagnetique, Centre National de la Recherche Scientifique et Universite ParisSud, Btiment 209C, F-91405 Orsay Cedex, France
• OSTI ID: 6280852
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 33:1; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
BREMSSTRAHLUNG
COLLISIONS
CROSS SECTIONS
DISSOCIATION
ELECTROMAGNETIC RADIATION
ELEMENTS
FANO FACTOR
HYDROGEN
MOLECULE COLLISIONS
NONMETALS
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
RADIATIONS
SYNCHROTRON RADIATION
TOTAL CROSS SECTIONS