Precise and Accurate Measurements of Strong-Field Photoionization and a Transferable Laser Intensity Calibration Standard

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Wallace, WC
Ghafur, O
Khurmi, C
Sainadh, Satya U
Calvert, JE
Laban, DE
Pullen, MG
Bartschat, K
Grum-Grzhimailo, AN
Wells, D
Quiney, HM
Tong, XM
Litvinyuk, IV
Sang, RT
Kielpinski, D
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2016
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Abstract

Ionization of atoms and molecules in strong laser fields is a fundamental process in many fields of research, especially in the emerging field of attosecond science. So far, demonstrably accurate data have only been acquired for atomic hydrogen (H), a species that is accessible to few investigators. Here, we present measurements of the ionization yield for argon, krypton, and xenon with percent-level accuracy, calibrated using H, in a laser regime widely used in attosecond science. We derive a transferable calibration standard for laser peak intensity, accurate to 1.3%, that is based on a simple reference curve. In addition, our measurements provide a much needed benchmark for testing models of ionization in noble-gas atoms, such as the widely employed single-active electron approximation.

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Physical Review Letters

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117

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5

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© 2016 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.

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Mathematical sciences

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Engineering

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