Communications: Development and characterization of a source of rotationally cold, enriched para-H3+
- 25 February 2010
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 132 (8), 081103
- https://doi.org/10.1063/1.3322827
Abstract
In an effort to develop a source of H3+ that is almost entirely in a single quantum state (J=K=1), we have successfully generated a plasma that is enriched to ∼83% in para-H3+ at a rotational temperature of 80 K. This enrichment is a result of the nuclear spin selection rules at work in hydrogenic plasmas, which dictate that only para-H3+ will form from para-H2, and that para-H3+ can be converted to ortho-H3+ by subsequent reaction with H2. This is the first experimental study in which the H2 and H3+ nuclear spin selection rules have been observed at cold temperatures. The ions were produced from a pulsed solenoid valve source, cooled by supersonic expansion, and interrogated via continuous-wave cavity ringdown spectroscopy.Keywords
This publication has 23 references indexed in Scilit:
- Spectroscopy and dissociative recombination of the lowest rotational states of H+3Journal of Physics: Conference Series, 2009
- Interstellar H 3 +Proceedings of the National Academy of Sciences of the United States of America, 2006
- Dissociative recombination of rotationally coldPhysical Review A, 2004
- Selection rules for nuclear spin modifications in ion-neutral reactions involving H3+The Journal of Chemical Physics, 2000
- Observation of Ortho-ParaSelection Rules in Plasma ChemistryPhysical Review Letters, 1997
- Experimental investigations of ion–molecule reactions relevant to interstellar chemistryJournal of the Chemical Society, Faraday Transactions, 1993
- The infrared spectrum ofin laboratory and space plasmasReviews of Modern Physics, 1992
- A high-intensity multi-purpose piezoelectric pulsed molecular beam sourceReview of Scientific Instruments, 1989
- Mehrkörperprobleme und Resonanz in der Quantenmechanik. IIThe European Physical Journal A, 1927
- Zur Deutung der Molekelspektren. IIThe European Physical Journal A, 1927