Phys. Rev. A 79, 033412 (2009) [5 pages]Signatures of the classical transition state in atomic quantum spectraReceived 12 February 2009; published 19 March 2009 We perform quantum-mechanically exact calculations of resonances in the spectrum of the hydrogen atom in crossed external fields and establish a close connection between the classical transition state in phase space and features in the quantum spectrum. By varying the external field strengths, structures are revealed which are surprisingly similar to the quantized energy levels of the classical electron motion in the vicinity of the saddle point obtained with an approximation of the potential. The results give clear evidence for signatures of the transition state in quantum spectra. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.79.033412
DOI:
10.1103/PhysRevA.79.033412
PACS:
32.60.+i, 32.80.Fb, 82.20.Db
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