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Title: Counting the electrons in a multiphoton ionization by elastic scattering of microwaves

Multiphoton ionization (MPI) is a fundamental first step in high-energy laser-matter interaction and is important for understanding the mechanism of plasma formation. With the discovery of MPI more than 50 years ago, there were numerous attempts to determine the basic physical constants of this process in direct experiments, namely photoionization rates and cross-sections of the MPI; however, no reliable data was available until now, and the spread in the literature values often reaches 2–3 orders of magnitude. This is due to the inability to conduct absolute measurements of plasma electron numbers generated by MPI, which leads to uncertainties and, sometimes, contradictions between MPI cross-section values utilized by different researchers across the field. Here, we report the first direct measurement of absolute plasma electron numbers generated at MPI of air, and subsequently we precisely determine the ionization rate and cross-section of eight-photon ionization of oxygen molecule by 800 nm photons σ 8 = (3.3 ± 0.3)×10 -130 W -8m 16s -1. The method, based on the absolute measurement of the electron number created by MPI using elastic scattering of microwaves off the plasma volume in Rayleigh regime, establishes a general approach to directly measure and tabulate basic constants of the MPImore » process for various gases and photon energies.« less
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [1] ;  [2] ;  [1]
  1. Purdue Univ., West Lafayette, IN (United States). School of Aeronautics and Astronautics
  2. Purdue Univ., West Lafayette, IN (United States). School of Mechanical Engineering
  3. Princeton Univ., NJ (United States). Dept. of Mechanical and Aerospace Engineering
Publication Date:
Grant/Contract Number:
SC0018156; 1465061
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; laser-produced plasmas; plasma physics
OSTI Identifier:
1499979

Sharma, A., Slipchenko, M. N., Shneider, M. N., Wang, X., Rahman, K. A., and Shashurin, A.. Counting the electrons in a multiphoton ionization by elastic scattering of microwaves. United States: N. p., Web. doi:10.1038/s41598-018-21234-y.
Sharma, A., Slipchenko, M. N., Shneider, M. N., Wang, X., Rahman, K. A., & Shashurin, A.. Counting the electrons in a multiphoton ionization by elastic scattering of microwaves. United States. doi:10.1038/s41598-018-21234-y.
Sharma, A., Slipchenko, M. N., Shneider, M. N., Wang, X., Rahman, K. A., and Shashurin, A.. 2018. "Counting the electrons in a multiphoton ionization by elastic scattering of microwaves". United States. doi:10.1038/s41598-018-21234-y. https://www.osti.gov/servlets/purl/1499979.
@article{osti_1499979,
title = {Counting the electrons in a multiphoton ionization by elastic scattering of microwaves},
author = {Sharma, A. and Slipchenko, M. N. and Shneider, M. N. and Wang, X. and Rahman, K. A. and Shashurin, A.},
abstractNote = {Multiphoton ionization (MPI) is a fundamental first step in high-energy laser-matter interaction and is important for understanding the mechanism of plasma formation. With the discovery of MPI more than 50 years ago, there were numerous attempts to determine the basic physical constants of this process in direct experiments, namely photoionization rates and cross-sections of the MPI; however, no reliable data was available until now, and the spread in the literature values often reaches 2–3 orders of magnitude. This is due to the inability to conduct absolute measurements of plasma electron numbers generated by MPI, which leads to uncertainties and, sometimes, contradictions between MPI cross-section values utilized by different researchers across the field. Here, we report the first direct measurement of absolute plasma electron numbers generated at MPI of air, and subsequently we precisely determine the ionization rate and cross-section of eight-photon ionization of oxygen molecule by 800 nm photons σ8 = (3.3 ± 0.3)×10-130 W-8m16s-1. The method, based on the absolute measurement of the electron number created by MPI using elastic scattering of microwaves off the plasma volume in Rayleigh regime, establishes a general approach to directly measure and tabulate basic constants of the MPI process for various gases and photon energies.},
doi = {10.1038/s41598-018-21234-y},
journal = {Scientific Reports},
number = ,
volume = 8,
place = {United States},
year = {2018},
month = {2}
}