We have studied, via laser absorption spectroscopy, the velocity distribution of 7Li atoms released from a solid neon matrix at cryogenic temperatures. The Li atoms are implanted into the Ne matrix by laser ablation of a solid Li precursor. A heat pulse is then applied to the sapphire substrate sublimating the matrix together with the isolated atoms at around 12 K. We find interesting differences in the velocity distribution of the released Li atoms from the model developed for our previous experiment with Cr [R. Lambo, C. C. Rodegheri, D. M. Silveira, and C. L. Cesar, Phys. Rev. A 76, 061401–R (2007)] https://doi.org/10.1103/PhysRevA.76.061401. This may be due to the sublimation regime, which is at much lower flux for the Li experiment than for the Cr experiment, as well as to the different collisional cross sections between those species to the Ne gas. We find a drift velocity compatible with Li being thermally sublimated at 11–13 K, while the velocity dispersion around this drift velocity is low, around 5–7 K. With a slow sublimation of the matrix we can determine the penetration depth of the laser ablated Li atoms into the Ne matrix, an important information that is not usually available in most matrix isolation spectroscopy setups. The present results with Li, together with the previous results with Cr suggest this to be a general technique for obtaining cryogenic atoms, for spectroscopic studies, as well as for trap loading. The release of the isolated atoms is also a useful tool to study and confirm details of the matrix isolated atoms which are masked or poorly understood in the solid.
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7 October 2011
Research Article|
October 03 2011
Spectroscopy of lithium atoms sublimated from isolation matrix of solid Ne
R. L. Sacramento;
R. L. Sacramento
1Instituto de Física,
Universidade Federal do Rio de Janeiro
, Caixa Postal 68528, 21941-972 Rio de Janeiro, RJ, Brazil
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L. A. Scudeller;
L. A. Scudeller
1Instituto de Física,
Universidade Federal do Rio de Janeiro
, Caixa Postal 68528, 21941-972 Rio de Janeiro, RJ, Brazil
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R. Lambo;
R. Lambo
1Instituto de Física,
Universidade Federal do Rio de Janeiro
, Caixa Postal 68528, 21941-972 Rio de Janeiro, RJ, Brazil
2Presently at
University of Science and Technology of China
, Hefei, Anhui 230026, China
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P. Crivelli;
P. Crivelli
1Instituto de Física,
Universidade Federal do Rio de Janeiro
, Caixa Postal 68528, 21941-972 Rio de Janeiro, RJ, Brazil
3Presently at ETH Zurich,
Institute for Particle Physics
, 8093 Zurich, Switzerland
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C. L. Cesar
C. L. Cesar
a)
1Instituto de Física,
Universidade Federal do Rio de Janeiro
, Caixa Postal 68528, 21941-972 Rio de Janeiro, RJ, Brazil
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Chem. Phys. 135, 134201 (2011)
Article history
Received:
July 28 2011
Accepted:
September 11 2011
Citation
R. L. Sacramento, L. A. Scudeller, R. Lambo, P. Crivelli, C. L. Cesar; Spectroscopy of lithium atoms sublimated from isolation matrix of solid Ne. J. Chem. Phys. 7 October 2011; 135 (13): 134201. https://doi.org/10.1063/1.3644896
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