Absolute Measurement of Laser Ionization Yield in Atmospheric Pressure Range Gases over 14 Decades

被引：16
|
作者：
Woodbury, D. [1 ]
Schwartz, R. M. [1 ]
Rockafellow, E. [1 ]
Wahlstrand, J. K. [2 ]
Milchberg, H. M. [1 ]
机构：
[1] Univ Maryland, Inst Res Elect & Appl Phys, College Pk, MD 20742 USA
[2] NIST, Phys Measurement Lab, Gaithersburg, MD 20899 USA
来源：
PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 01期
基金：
美国国家科学基金会;
关键词：
MULTIPHOTON IONIZATION; TUNNEL IONIZATION; ATOMS; FIELD; DIAGNOSTICS; DENSITIES; PULSES;
D O I：
10.1103/PhysRevLett.124.013201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Strong-field ionization is central to intense laser-matter interactions. However, standard ionization measurements have been limited to extremely low density gas samples, ignoring potential high density effects. Here, we measure strong-field ionization in atmospheric pressure range air, N-2, and Ar over 14 decades of absolute yield, using mid-IR picosecond avalanche multiplication of single electrons. Our results are consistent with theoretical rates for isolated atoms and molecules and quantify the ubiquitous presence of ultralow concentration gas contaminants that can significantly affect laser-gas interactions.
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页数：6
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