Reduced absorption of neon-like bromine X-ray laser radiation in helium |
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Authors: | P Lu EE Fill |
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Institution: | (1) Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany, DE |
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Abstract: | We have measured the absorption of the 19.47-nm neon like bromine (J=2–1) X-ray laser line in low-pressure helium. The experiment
was motivated by the coincidence of this line with the low-absorption wing of an autoionizing transition in helium. We observe
that, with 1 mbar of helium, the continuum background and another bromine X-ray laser line at 19.82 nm are strongly reduced,
enhancing the relative strength of the 19.47-nm laser line. Increasing the helium pressure to 1.5 mbar makes the continuum
virtually disappear, resulting in an almost monochromatic emission of the X-ray laser line. An estimate of the absorption
cross section for the 19.47-nm line is given as ≈3.9×10-19 cm2 and for the nearby continuum as 0.9–1.3×10-18 cm2.
Received: 8 March 1999 / Revised version: 26 April 1999 / Published online: 11 August 1999 |
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Keywords: | PACS: 32 30 Rj 32 80 Dz 42 55 Vc |
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