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

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 addres...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2007-12, Vol.76 (6), Article 061402
Main Authors: Motsch, M., Schenk, M., van Buuren, L. D., Zeppenfeld, M., Pinkse, P. W. H., Rempe, G.
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
COOLING
DISSOCIATION
DISTRIBUTION
ENTROPY
EXCITATION
FORMALDEHYDE
IMPURITIES
LASER RADIATION
MOLECULAR BEAMS
MOLECULES
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
SPECTROSCOPY
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
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Summary: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.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.76.061402