A novel vacuum ultra violet lamp for metastable rare gas experiments

Daerr, Heiner; Kohler, Markus; Sahling, Peter; Tippenhauer, Sandra; Arabi-Hashemi, Ariyan; Becker, Christoph; Sengstock, Klaus; Kalinowski, Martin B.

doi:10.1063/1.3610465

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A novel vacuum ultra violet lamp for metastable rare gas experiments

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Kohler, Markus
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Citation

Daerr, H., Kohler, M., Sahling, P., Tippenhauer, S., Arabi-Hashemi, A., Becker, C., et al. (2011). A novel vacuum ultra violet lamp for metastable rare gas experiments. REVIEW OF SCIENTIFIC INSTRUMENTS, 82(7): 073106. doi:10.1063/1.3610465.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-15F4-C

Abstract

We report on a new design of a vacuum ultra violet (VUV) lamp for direct optical excitation of high laying atomic states, e.g., for excitation of metastable rare gas atoms. The lamp can be directly mounted to ultra-high vacuum vessels (p <= 10(-10) mbar). It is driven by a 2.45 GHz microwave source. For optimum operation, it requires powers of similar to 20 W. The VUV light is transmitted through a magnesium fluoride window, which is known to have a decreasing transmittance for VUV photons with time. In our special setup, after a run-time of the VUV lamp of 550 h the detected signal continuously decreased to 25% of its initial value. This corresponds to a lifetime increase of two orders of magnitude compared to previous setups or commercial lamps. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3610465]