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Multiphoton ionization of atomic cesium [electronic resource].

Published
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1984.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 14 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
We describe experimental studies of resonantly enhanced multiphoton ionization (MPI) of cesium atoms in the presence and absence of an external electric field. In the zero-field studies, photoelectron angular distributions for one- and two-photon resonantly enhanced MPI are compared with the theory of Tang and Lambropoulos. Deviations of experiment from theory are attributed to hyperfine coupling effects in the resonant intermediate state. The agreement between theory and experiment is excellent. In the absence of an external electric field, signal due to two-photon resonant three-photon ionization of cesium via np states is undetectable. Application of an electric field mixes nearby nd and ns levels, thereby inducing excitation and subsequent ionization. Signal due to two-photon excitation of ns levels in field-free experiments is weak due to their small photoionization cross section. An electric field mixes nearby np levels which again allows detectable photoionization signal. For both ns and np states the field induced MPI signal increases as the square of the electric field for a given principal quantum number and increases rapidly with n for a given field strength. Finally, we note that the classical two-photon field-ionization threshold is lower for the case in which the laser polarization and the electric field are parallel than it is when they are perpendicular. 22 references, 11 figures.
Report Numbers
E 1.99:conf-840387-13
conf-840387-13
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Note
Published through SciTech Connect.
01/01/1984.
"conf-840387-13"
"DE85001266"
2. topical meeting on laser techniques in the extreme ultraviolet, Boulder, CO, USA, 5 Mar 1984.
Cooper, C.D.; Compton, R.N.; Stockdale, J.A.D.; Klots, C.E.
Funding Information
AC05-84OR21400
View MARC record | catkey: 13807402