Abstract
WITH the aid of the new Agfa infra-red sensitive plates (maximum of sensitivity 10,600 A.) I have succeeded in photographing the solar spectrum to 12,900 A. in the first order of a 3 m. grating (dispersion 5 A./mm., time of exposure 10 hours). The blackening of the exposure obtained does not alter appreciably from 12,400 to 12,900 A. (end of the plate used), so that it seems easily possible to extend the limit quite considerably.
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References
R. Mecke, and W. Baumann, "Das ultrarote Sonnenspektrum von 7500–10,000 A.", Leipzig, 1933.
J. W. Ellis, and H. O. Kneser, Z. Phys., 86, 583 ; 1933.
R. S. Mulliken, Phys. Rev., 32, 880 ; 1928.
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HERZBERG, G. Photography of the Infra-Red Solar Spectrum to Wave-length 12,900 A. Nature 133, 759 (1934). https://doi.org/10.1038/133759a0
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DOI: https://doi.org/10.1038/133759a0
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