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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Vol. 1, Iss. 4 — Apr. 20, 2003
  • pp: 187–189

An investigation of high fractions of metastable helium atoms

X. P. Feng and B. W. James  »View Author Affiliations


Chinese Optics Letters, Vol. 1, Issue 4, pp. 187-189 (2003)


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Abstract

Penning type discharge was adopted to excite helium atoms. It is suitable for generating high density of metastables at a range from 0.1 mTorr to 0.5 Torr. The highest metastable density of 3.5 * 10^(10) cm^(-3) was observed at a static gas pressure of 0.5 Torr. The highest fraction of metastables (N_(2^(1)S) = N_(He)) of 10^(-3) in a low gas pressure was obtained. The variation of the magnetic field strength on the discharge does not result in a significant density change of the metastable helium atoms. When no magnetic field was applied, no discharge took place.

© 2005 Chinese Optics Letters

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.2070) Atomic and molecular physics : Effects of collisions
(020.6580) Atomic and molecular physics : Stark effect

Citation
X. P. Feng and B. W. James, "An investigation of high fractions of metastable helium atoms," Chin. Opt. Lett. 1, 187-189 (2003)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-1-4-187

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