J. Phys. II France
Volume 7, Numéro 5, May 1997
Page(s) 687 - 705
DOI: 10.1051/jp2:1997103
J. Phys. II France 7 (1997) 687-705

Study of a Calcium Afterglow in a Broida Oven

F. Fethi1, M. Bourgoin1, F. Poblete2 and G. Taieb1

1  Laboratoire de Photophysique Moléculaire du CNRS, Université de Paris-Sud, Bâtiment 213, 91405 Orsay Cedex, France
2  Departamento de Quimica-Fisica Facultad de Ciencias, Campus Universitario S/N, Universidad de Castilla La Mancha, 13071 Ciudad Real, Spain

(Received 12 June 1996, received in final form 4 February 1997, accepted 15 February 1997)

A systematic study of a Broida source producing atomic calcium in ground state 1S and first metastable 1D and 3P states is presented. The relative concentration of the metastables, produced by a DC discharge, is monitored with carrier gas pressure, heating power and discharge current, and it is observed that low values of these parameters are favourable to 1D formation. These results are interpreted in terms of relative values of cross section of energy pooling forming the first resonant state 1P, and the ratio of these cross section is estimated to be $\sigma(^3{\rm P}-^3{\rm P})/\sigma(^1{\rm D}-^1{\rm D}) \ne 5 \times 10^{-4}$. Some properties of the source are described, including auto-absorptions of transitions originating from the 3P and collisional relaxation of reaction products of Ca with halogenated compounds. An example of utilization of the source for the study of metastable reactivity is presented.

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