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APS » Journals » Phys. Rev. Lett. » Volume 79 » Issue 18
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Phys. Rev. Lett. 79, 3367–3370 (1997)

Controlling the Branching Ratio of Photoionization Products under Two-Color Excitation: Competition between ac Stark Splitting and Two-Path Interference

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Takashi Nakajima1, Jian Zhang2, and P. Lambropoulos2,3
1The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama, 351-01, Japan
2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
3F.O.R.TH., Institute of Electronic Structure and Laser and Department of Physics, University of Crete, P.O. Box 1527, Heraklion 711 10, Crete, Greece

Received 27 June 1997; published in the issue dated 3 November 1997

We investigate the variation of the photoionization yields into different ionic channels by means of the one-photon-near-resonant two-photon ionization scheme under two-color excitation. We present a general formulation and the results of specific calculations pertaining to the Ca atom with realistic parameters. A significant change of the ionization into Ca+ 4s, 3d, and 4p channels has been observed as a detuning is varied, which agrees qualitatively well with the observation by Wang, Chen, and Elliott [Phys. Rev. Lett. 77, 2416 (1996)] for the Ba atom. The importance of the laser intensity effects is also addressed.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.3367
DOI:
10.1103/PhysRevLett.79.3367
PACS:
32.80.Qk, 32.80.Fb, 33.80.-b
 
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