Orientation of Cs 6p 2P3/2 atomic photofragments in a magnetic field: interference in the photodissociation of diatomic molecules
Tsukuba Magnet Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba, 305-0003, Japan
Corresponding author: a firstname.lastname@example.org
Published online: 20 December 2005
In a magnetic field, Cs2 molecules were excited from the ground X1Σ+g(vX=0,JX=55) level to the D 1Σ+u(v=46,J=54) level by dissociation laser light linearly polarized parallel to the field, for which the magnetic sublevels were degenerated and thus all the transitions between them were simultaneously stimulated. Probe laser light excited the dissociated Cs 6p2P3/2 atomic fragments to 6p2D3/2 level and the resultant 6p2P1/2 - 6d2D3/2 emission was detected as the function of the wavelength of the probe light. The populations of the 6p2P3/2,mj magnetic sublevels were determined from the relative strengths of the 6p2P3/2,mj - 6d2D3/2,m'j transitions induced by the probe light. Non-zero orientation O0 was found in the ensemble of dissociated Cs 6p2P3/2 atomic fragments. The orientation O0 increased as the magnetic field strength increased. It was demonstrated both experimentally and theoretically that the orientation O0 was induced through the interference in the excitation and dissociation paths in the presence of an external magnetic field, even when all degenerated transitions between the magnetic sublevels of the molecules are simultaneously excited by the light linearly polarized parallel to the field.
PACS: 33.80.Gj – Diffuse spectra; predissociation, photodissociation / 33.55.Be – Zeeman and Stark effects / 42.25.Hz – Interference
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006