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XUV Spectra of Ag XVII - Ag XXI and Cd XVIII - Cd XXII from Laser Produced Plasmas

Published online by Cambridge University Press:  12 April 2016

M.A. Khan ,
H.A. Al-Juwair  and
G.J. Tallents
M.A. Khan
Affiliation:
Department of Physics, University of Petroleum & Minerals Dhahran, Saudi Arabia
H.A. Al-Juwair
Affiliation:
Department of Physics, University of Petroleum & Minerals Dhahran, Saudi Arabia
G.J. Tallents
Affiliation:
Department of Engineering Physics Research School of Physical Sciences, The Australian National University Canberra, Australia

Extract

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The spectra of highly ionized Ag and Cd in the region 20–200 Å excited in laser produced plasmas were recorded and analyzed. The spectral lines identified correspond to Ag XVII - Ag XXI and Cd XVIII -Cd XXII involving transitions of the type 3dk n1 – 3dk nl' and 3dk – 3dk−l nl" where k = 9,10; n = 4,5,6; 1 = s,p,d,f; 1' = s,p,d,f,g, and 1" = p,f.

The experimental work was carried out at the Australian National University Research School of Physical Sciences. The Nd=glass laser system delivered pulsed powers of the order of 1015W/cm2 onto flat metalic targets placed in a vacuum. The target could be positioned accurately in the focal plane of the input lens. The spectra were recorded photographically on Kodak SC5 plates with a 2-m grazing incidence spectrograph (Hilger & Watts E-580) employing a 600 lines/mm grating at 88.157° incidence. A maximum of three laser pulses gave the desired plate exposure while a single shot exposure from a pure carbon target plasma provided the reference points for wavelength calibration. The well-known Lyman spectra of CVI and CV appeared strong and could be clearly identified upto their 5th order. The wavelengths of some strong lines of Ag XIX and Cd XX previously measured (1) were used as secondary wavelength standards and a best fit was then made with the wavelengths computed from the dispersion equation of the grating. The accuracy of the measured wavelengths was within 0.02A° and better than 0.005A° at points closer to the reference lines.

Type
Papers not Presented at the Meeting
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 266 - 269
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

References

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