Abstract

A method is described for the measurement of depolarization factors in Raman spectra which utilizes the spectral intensity traces obtained directly on a recording monochromator. A dry ice-refrigerated multiplier photo-tube is used as a detector with additional d.c. amplification. The initial photo-current, amplified some 108-fold, is continuously traced on a galvanometer deflection recorder of sensitivity 10−9 amp./mm. Analysis of the partially polarized scattered Raman light is made by means of a Polaroid oriented to obtain one record each for the parallel and perpendicular intensities. The instrument responds to the parallel and perpendicular intensities in the ratio of 0.82 to 1.00. Thus, the apparent depolarizations determined by this method were divided by 0.82 to correct for the in equivalence of transmission by the instrument for the two types of polarization. Values thus obtained for the principal Raman lines of benzene, chloroform, carbon tetrachloride, and symmetrical tetrachloroethane are tabulated together with results published by other authors. Values obtained for the depolarization factors ρ agree satisfactorily with the values for the same molecules using the generally accepted method of Cabannes and Rousset.

© 1943 Optical Society of America

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References

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  1. J. Cabannes, Comptes rendus 187, 654 (1928).
  2. J. Cabannes and A. Rousset, Ann. de physique 19, 229 (1933).
  3. G. Placzek and W. R. Van Wijk, Zeits. f. Physik 67, 582 (1931).
    [Crossref]
  4. D. H. Rank, R. J. Pfister, and P. D. Coleman, J. Opt. Soc. Am. 32, 390 (1942).
    [Crossref]
  5. W. R. Angus, C. K. Ingold, and A. H. Leckie, J. Chem. Soc.926 (1936).
  6. R. Ananthakrishnan, Proc. Ind. Acad. Sci. A2, 133 (1935).
  7. B. Trumpy, Zeits. f. Physik 93, 624 (1934).
    [Crossref]

1942 (1)

D. H. Rank, R. J. Pfister, and P. D. Coleman, J. Opt. Soc. Am. 32, 390 (1942).
[Crossref]

1936 (1)

W. R. Angus, C. K. Ingold, and A. H. Leckie, J. Chem. Soc.926 (1936).

1935 (1)

R. Ananthakrishnan, Proc. Ind. Acad. Sci. A2, 133 (1935).

1934 (1)

B. Trumpy, Zeits. f. Physik 93, 624 (1934).
[Crossref]

1933 (1)

J. Cabannes and A. Rousset, Ann. de physique 19, 229 (1933).

1931 (1)

G. Placzek and W. R. Van Wijk, Zeits. f. Physik 67, 582 (1931).
[Crossref]

1928 (1)

J. Cabannes, Comptes rendus 187, 654 (1928).

Ananthakrishnan, R.

R. Ananthakrishnan, Proc. Ind. Acad. Sci. A2, 133 (1935).

Angus, W. R.

W. R. Angus, C. K. Ingold, and A. H. Leckie, J. Chem. Soc.926 (1936).

Cabannes, J.

J. Cabannes and A. Rousset, Ann. de physique 19, 229 (1933).

J. Cabannes, Comptes rendus 187, 654 (1928).

Coleman, P. D.

D. H. Rank, R. J. Pfister, and P. D. Coleman, J. Opt. Soc. Am. 32, 390 (1942).
[Crossref]

Ingold, C. K.

W. R. Angus, C. K. Ingold, and A. H. Leckie, J. Chem. Soc.926 (1936).

Leckie, A. H.

W. R. Angus, C. K. Ingold, and A. H. Leckie, J. Chem. Soc.926 (1936).

Pfister, R. J.

D. H. Rank, R. J. Pfister, and P. D. Coleman, J. Opt. Soc. Am. 32, 390 (1942).
[Crossref]

Placzek, G.

G. Placzek and W. R. Van Wijk, Zeits. f. Physik 67, 582 (1931).
[Crossref]

Rank, D. H.

D. H. Rank, R. J. Pfister, and P. D. Coleman, J. Opt. Soc. Am. 32, 390 (1942).
[Crossref]

Rousset, A.

J. Cabannes and A. Rousset, Ann. de physique 19, 229 (1933).

Trumpy, B.

B. Trumpy, Zeits. f. Physik 93, 624 (1934).
[Crossref]

Van Wijk, W. R.

G. Placzek and W. R. Van Wijk, Zeits. f. Physik 67, 582 (1931).
[Crossref]

Ann. de physique (1)

J. Cabannes and A. Rousset, Ann. de physique 19, 229 (1933).

Comptes rendus (1)

J. Cabannes, Comptes rendus 187, 654 (1928).

J. Chem. Soc. (1)

W. R. Angus, C. K. Ingold, and A. H. Leckie, J. Chem. Soc.926 (1936).

J. Opt. Soc. Am. (1)

D. H. Rank, R. J. Pfister, and P. D. Coleman, J. Opt. Soc. Am. 32, 390 (1942).
[Crossref]

Proc. Ind. Acad. Sci. (1)

R. Ananthakrishnan, Proc. Ind. Acad. Sci. A2, 133 (1935).

Zeits. f. Physik (2)

B. Trumpy, Zeits. f. Physik 93, 624 (1934).
[Crossref]

G. Placzek and W. R. Van Wijk, Zeits. f. Physik 67, 582 (1931).
[Crossref]

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Figures (2)

Fig. 1
Fig. 1

Schematic diagram of light source and optical appurtenances for measurement of depolarization factors. A, mercury arc; C, cylindrical lens; T, scattering tube; P, Polaroid disk; M1, plane mirror.

Fig. 2
Fig. 2

The perpendicular and parallel spectral intensity traces of the Raman lines of carbon tetrachloride. Two successive records were taken with an f:4.5 recording monochromator, the first with the Polaroid set to transmit the perpendicular intensity and the second with the Polaroid set to transmit the parallel intensity.

Tables (1)

Tables Icon

Table I A comparison of values of depolarization factors determined by various authors.