Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6972
Title: Time-resolved optical emission spectroscopic studies of picosecond laser produced Cr plasma
Authors: Rao, Kavya H
Smijesh, N.
Klemke, N.
Philip, Reji
Litvinyuk, I V
Sang, R.T.
Issue Date: 5-Jun-2018
Publisher: American Institute of Physics
Citation: Physics of Plasmas. 2018, Vol. 25. p063505
Abstract: Time-resolved optical emission spectroscopic measurements of a plasma generated by irradiating a Cr target using 60 picosecond (ps) and 300 ps laser pulses are carried out to investigate the variation in the line width (δλ) of emission from neutrals and ions for increasing ambient pressures. Measurements ranging from 10−6 Torr to 102 Torr show a distinctly different variation in the δλ of neutrals (Cr I) compared to that of singly ionized Cr (Cr II), for both irradiations. δλ increases monotonously with pressure for Cr II, but an oscillation is evident at intermediate pressures for Cr I. This oscillation does not depend on the laser pulse widths used. In spite of the differences in the plasma formation mechanisms, it is experimentally found that there is an optimum intermediate background pressure for which δλ of neutrals drops to a minimum. Importantly, these results underline the fact that for intermediate pressures, the usual practice of calculating the plasma number density from the δλ of neutrals needs to be judiciously done, to avoid reaching inaccurate conclusions
Description: Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI: http://hdl.handle.net/2289/6972
ISSN: 070-664X
1089-7674 (online)
Alternative Location: https://arxiv.org/abs/1802.07436
https://doi.org/10.1063/1.5026417
Copyright: 2018 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the authors and the American Institute of Physics.
Appears in Collections:Research Papers (LAMP)

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