Internal-state thermometry by depletion spectroscopy in a cold guided beam of formaldehyde

M. Motsch*, M. Schenk, L. D. Van Buuren, M. Zeppenfeld, P. W H Pinkse, G. Rempe

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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We present measurements of the internal state distribution of electrostatically guided formaldehyde. Upon excitation with continuous tunable ultraviolet laser light the molecules dissociate, leading to a decrease in the molecular flux. The population of individual guided states is measured by addressing transitions originating from them. The measured populations of selected states show good agreement with theoretical calculations for different temperatures of the molecule source. The purity of the guided beam as deduced from the entropy of the guided sample using a source temperature of 150 K corresponds to that of a thermal ensemble with a temperature of about 30 K.

Original languageEnglish
Article number061402
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number6
Publication statusPublished - 20 Dec 2007
Externally publishedYes


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