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Absolute Intensity Calibration at 26 Å by Branching Ratios to the Visible

Published online by Cambridge University Press:  12 April 2016

F. E. Irons  and
N. J. Peacock
F. E. Irons
Affiliation:
Culham Laboratory, Abingdon, Berks., England
N. J. Peacock
Affiliation:
Culham Laboratory, Abingdon, Berks., England

Extract

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The technique for absolute calibration using the branching ratio of two transitions which have a common upper level but widely separated energies has been employed and described by Griffin and McWhirter (1961).

Using the plasma produced by irradiation of a carbon target with a 1 GW, 6 nsec duration, neodymium laser pulse, we have been able to calibrate a grazing incidence spectrograph at the wavelength (25.83 Å) of the 7–1 transition in C VI by direct comparison with the intensity of the 7–6 (3434 Å) transition emitted from the same ions in the plasma. The spectrum from a similar carbon plasma has been described by Boland et al. (1968) and in several ways is ideal for this type of measurement.

Type
Section II / Excitation and Ionization: Theory and Experiments
Information
International Astronomical Union Colloquium , Volume 14: Special Issue: Ultraviolet and X-Ray Spectroscopy of Astrophysical and Laboratory Plasmas , November 1972 , pp. 561 - 562
Copyright
Copyright © Reidel 1972

References

Boland, B. C., Irons, F. E., and McWhirter, R. W. P.: 1968, J. Phys. B. 1, 1180.Google Scholar
Cooper, J. J.: 1966, Rep. Progr. Phys. 29, 35.CrossRefGoogle Scholar
Griffin, W. G. and McWhirter, R. W. P.: 1961, Proc. Conf. on Optical Insts. and Techniques, London.Google Scholar
Irons, F. E., McWhirter, R. W. P., and Peacock, N. J.: 1972, J. Phys. B., to be published.Google Scholar