Characteristics of electron‐beam‐excited Xe@B|2at low pressures as a vacuum ultraviolet source
作者:
D. J. Eckstrom,
H. H. Nakano,
D. C. Lorents,
T. Rothem,
J. A. Betts,
M. E. Lainhart,
D. A. Dakin,
J. E. Maenchen,
期刊:
Journal of Applied Physics
(AIP Available online 1988)
卷期:
Volume 64,
issue 4
页码: 1679-1690
ISSN:0021-8979
年代: 1988
DOI:10.1063/1.342474
出版商: AIP
数据来源: AIP
摘要:
The performance of Xe*2as a 172‐nm fluorescence or laser source when pumped by a low‐current, long‐pulse electron beam was determined. The fluorescence efficiency of Xe@B|2is near the theoretical limit of ∼50% at modest pressures over a range of pump rates up to 106W/cm. The laser efficiency is limited to values <1% by a very strong medium absorption that is probably due to Xe*2photoionization. Laser performance is further degraded by early pulse termination that appears related to mirror degradation. An improved kinetics and extraction code was developed to model the performance of the Xe@B|2system. A key component of the model is a more detailed treatment of the interactions between secondary electrons and excited atomic and molecular xenon states. Rates for these processes were derived as described herein. With this model, good absolute agreement was obtained between experiments and calculated parameters at pressures as low as 0.5 atm.
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