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Title: Interferometric measurements of dynamic polarizabilities for metal atoms using electrically exploding wires in vacuum.

Abstract

Measurements within 10% accuracy of the dynamic dipole polarizabilities {alpha}({lambda}) for five nonrefractory metal atoms (Mg, Ag, Al, Cu, and Au) at laser wavelengths of {lambda} = 532 and 1064 nm are presented using electrical explosion of thin wires in vacuum and a novel laser probing integrated-phase technique. The technique is based on single-wavelength interferometry and does not require axial symmetry of the tested object. Theoretical prediction of {alpha}({lambda}) for wavelengths {lambda} = 355, 532, and 1064 nm, as well as the static dipole polarizabilities {alpha}{sub st}, are also presented. An agreement within 20% was obtained between calculated data, recommended static polarizabilities {alpha}{sub st}, and the measured dynamic polarizabilities {alpha}(532 nm) and {alpha}(1064 nm).

Authors:
;  [1];  [1];  [2]
  1. (P.N. Lebedev Physical Institute, Moscow, Russia)
  2. (Ktech Corporation, Albuquerque, NM)
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
952125
Report Number(s):
SAND2006-0881J
TRN: US200913%%315
DOE Contract Number:
AC04-94AL85000
Resource Type:
Journal Article
Resource Relation:
Journal Name: Proposed for publication in the American Physical Society: Physical Review A.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MAGNESIUM; SILVER; ALUMINIUM; COPPER; GOLD; POLARIZABILITY; EXPLODING WIRES; INTERFEROMETRY

Citation Formats

Struve, Kenneth William, Beigman, I.L., Shevel'ko, Viacheslav Petrovich, and Sarkisov, Gennady Sergeevich. Interferometric measurements of dynamic polarizabilities for metal atoms using electrically exploding wires in vacuum.. United States: N. p., 2006. Web.
Struve, Kenneth William, Beigman, I.L., Shevel'ko, Viacheslav Petrovich, & Sarkisov, Gennady Sergeevich. Interferometric measurements of dynamic polarizabilities for metal atoms using electrically exploding wires in vacuum.. United States.
Struve, Kenneth William, Beigman, I.L., Shevel'ko, Viacheslav Petrovich, and Sarkisov, Gennady Sergeevich. Sun . "Interferometric measurements of dynamic polarizabilities for metal atoms using electrically exploding wires in vacuum.". United States. doi:.
@article{osti_952125,
title = {Interferometric measurements of dynamic polarizabilities for metal atoms using electrically exploding wires in vacuum.},
author = {Struve, Kenneth William and Beigman, I.L. and Shevel'ko, Viacheslav Petrovich and Sarkisov, Gennady Sergeevich},
abstractNote = {Measurements within 10% accuracy of the dynamic dipole polarizabilities {alpha}({lambda}) for five nonrefractory metal atoms (Mg, Ag, Al, Cu, and Au) at laser wavelengths of {lambda} = 532 and 1064 nm are presented using electrical explosion of thin wires in vacuum and a novel laser probing integrated-phase technique. The technique is based on single-wavelength interferometry and does not require axial symmetry of the tested object. Theoretical prediction of {alpha}({lambda}) for wavelengths {lambda} = 355, 532, and 1064 nm, as well as the static dipole polarizabilities {alpha}{sub st}, are also presented. An agreement within 20% was obtained between calculated data, recommended static polarizabilities {alpha}{sub st}, and the measured dynamic polarizabilities {alpha}(532 nm) and {alpha}(1064 nm).},
doi = {},
journal = {Proposed for publication in the American Physical Society: Physical Review A.},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • Measurements within 10% accuracy of the dynamic dipole polarizabilities {alpha}({lambda}) for five nonrefractory metal atoms (Mg, Ag, Al, Cu, and Au) at laser wavelengths of {lambda}=532 and 1064 nm are presented using electrical explosion of thin wires in vacuum and a novel laser probing integrated-phase technique. The technique is based on single-wavelength interferometry and does not require axial symmetry of the tested object. Theoretical prediction of {alpha}({lambda}) for wavelengths {lambda}=355, 532, and 1064 nm, as well as the static dipole polarizabilities {alpha}{sub st}, are also presented. An agreement within 20% was obtained between calculated data, recommended static polarizabilities {alpha}{sub st},more » and the measured dynamic polarizabilities {alpha}(532 nm) and {alpha}(1064 nm)« less
  • The dynamic scalar and tensor polarizabilities of the rare-earth-metal atoms are calculated with time-dependent density functional theory. The frequency-dependent polarizabilities at imaginary frequencies are used to determine the isotropic and orientation-dependent van der Waals coefficients for the interactions of the rare-earth-metal atoms with helium atoms. The static polarizabilities are compared with other theoretical values and with experimental results. The agreement is satisfactory in most cases but there are some exceptions where the discrepancy between theory and experiment is significant. The derived isotropic van der Waals coefficients range between 37 and 50 E{sub H}a{sub 0}{sup 6} and the orientation-dependent coefficients betweenmore » 2 and -1 E{sub H}a{sub 0}{sup 6}. Thus the ratio of elastic to inelastic scattering cross sections is expected to be substantial and any one of the rare-earth-metal atoms is an excellent candidate for trapping and cooling in a He gas.« less
  • Calibrated density measurements have been obtained of the coronal plasmas around exploding 7.5{endash}40 {mu}m {ital W} wires carrying 15{endash}120 kA per wire for 30{endash}70 ns. X-ray radiographs of the exploding wire plasmas using 2.5{endash}10 keV photons from a Mo wire {ital X}-pinch backlighter enabled measurements of areal densities of {ital W} ranging from 2{times}10{sup 17}/cm{sup 2}, equivalent to 0.03 {mu}m of solid density {ital W}, to about 10{sup 19}/cm{sup 2}. The rapidly expanding (few mm/{mu}s) coronal plasmas surrounding the slowly expanding ({lt}1 mm/{mu}s) residual wire cores have areal densities up to about 2{times}10{sup 18}/cm{sup 2}. Single 7.5 {mu}m wires testedmore » with 100 kA had as much as 90{percent} of the initial wire material in the coronal plasma. Coronal plasma {ital W} number densities were estimated to be up to a few times 10{sup 18}/cm{sup 3}, while core {ital W} densities as low as a few times 10{sup 20}/cm{sup 3} were observed. With linear arrays of four (eight) 7.5 {mu}m wires carrying 30 kA (15 kA)/wire, up to 35{percent} (25{percent}) of the initial {ital W} wire material was in the plasma around and between the wires at 46{endash}48 ns after the current started. Preheating the wires to drive off adsorbed gases and hydrocarbons increased the {ital W} mass in the coronal plasma and made it more uniform then when wires were not preheated. {copyright} {ital 1999 American Institute of Physics.}« less
  • For nanosecond electrical explosion of fine metal wires in vacuum generates calibrated, radially expanded gas cylinders of metal atoms are surrounded by low-density fast expanding plasma corona. Here, a novel integrated-phase technique, based on laser interferometry, provides the dynamic dipole polarizability of metal atoms. This data was previously unavailable for tungsten atoms. Furthermore, an extremely high melting temperature and significant pre-melt electronic emission make these measurements particularly complicated for this refractory metal.
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