Letter | Published:

Predissociation Phenomena in Spectra of some Diatomic Molecules

Nature volume 142, pages 669670 (08 October 1938) | Download Citation

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Abstract

IN emission at low pressure, the C-band (0,0) of strontium hydride is cut off above R(18) = 26,549 cm.-1, the upper level of which (C, v = 0, J = 19) lies 27,776 cm.-1 above the ground-level N, v = 0, J = 0. In spite of this, Watson and co-workers found no traces of the (1,0) band in emission at low pressure, though the levels C, v = 1, J = 1 to J = 6 lie only 27,620 to 27,770 cm.-1 above this ground-level (cf. More and Cornell1, table 1). Thus the statement of More and Cornell (p. 808) that the (1,0) band “lies far beyond the predissociation limit at Kâ = 19 in the (0, 0) band” must be incorrect. Consequently the predissociation occurs at an energy-level at least ˜150 cm.-1 lower in C, v = 1 than in v = 0. Previously Herzberg2 has found similar cases in the P2 and N2 molecules.

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References

  1. 1.

    , and , Phys. Rev., 53, 806 (1938).

  2. 2.

    , Ann. Phys., 15, 677 (1932). , and , Ann. Phys., 21, 577 (1934).

  3. 3.

    , Z. Phys., 99, 595 (1936); Dissertation, Stockholm, 1936. , and , Z. Phys., 100, 293 (1936).

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Affiliations

  1. Department of Physics, University of Stockholm. July 30.

    • BIRGER GRUNDSTRÖM

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DOI

https://doi.org/10.1038/142669b0

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