Abstract

A Raman source has been constructed and tested using a helical mercury lamp of the “Toronto” type. Studies of intensity versus mercury pool condenser temperature and versus lamp current indicate that a condition of maximum stability can be obtained by proper choice of current and condenser temperature. To aid in starting and to increase the efficiency of the lamp, a special lamphouse has been designed. The complete unit then provides stable, high intensity, mercury radiation at 4358A. Ratios of 4347A, 4339A, and background to 4358A are approximately 0.008, 0.002, and 0.0005, respectively. Background was measured at 4369A (45 cm−1 shift) and represents a maximum possible value.

© 1952 Optical Society of America

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References

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  1. J. J. Heigl and et al., Anal. Chem. 22, 154–159 (1950).
    [Crossref]
  2. H. L. Welsh, private communication.
  3. Applied Research Laboratories Brochure, Raman Equipment. (A paper describing the instrument referred to is in preparation.)
  4. MgO may be used with a slight gain in intensity.
  5. A. C. Menzies and J. Skinner, J. Sci. Instr. 26, 229–230 (1949).
    [Crossref]
  6. The scattering coefficient of a Raman band is defined as the ratio of the peak intensity of that band to the peak intensity of the 459 cm−1 band of 100 percent CCl4.
  7. D. H. Rank and J. S. McCartney, J. Opt. Soc. Am. 38, 279–281 (1948).
    [Crossref] [PubMed]

1950 (1)

J. J. Heigl and et al., Anal. Chem. 22, 154–159 (1950).
[Crossref]

1949 (1)

A. C. Menzies and J. Skinner, J. Sci. Instr. 26, 229–230 (1949).
[Crossref]

1948 (1)

Heigl, J. J.

J. J. Heigl and et al., Anal. Chem. 22, 154–159 (1950).
[Crossref]

McCartney, J. S.

Menzies, A. C.

A. C. Menzies and J. Skinner, J. Sci. Instr. 26, 229–230 (1949).
[Crossref]

Rank, D. H.

Skinner, J.

A. C. Menzies and J. Skinner, J. Sci. Instr. 26, 229–230 (1949).
[Crossref]

Welsh, H. L.

H. L. Welsh, private communication.

Anal. Chem. (1)

J. J. Heigl and et al., Anal. Chem. 22, 154–159 (1950).
[Crossref]

J. Opt. Soc. Am. (1)

J. Sci. Instr. (1)

A. C. Menzies and J. Skinner, J. Sci. Instr. 26, 229–230 (1949).
[Crossref]

Other (4)

The scattering coefficient of a Raman band is defined as the ratio of the peak intensity of that band to the peak intensity of the 459 cm−1 band of 100 percent CCl4.

H. L. Welsh, private communication.

Applied Research Laboratories Brochure, Raman Equipment. (A paper describing the instrument referred to is in preparation.)

MgO may be used with a slight gain in intensity.

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Figures (5)

F. 1
F. 1

Photo of ARL “Toronto” type helical lamp.

F. 2
F. 2

Intensity of 4358A Hg line vs lamp current at several condenser temperatures. Intensity is plotted as percentage of intensity at 15 amperes lamp current.

F. 3
F. 3

Intensity of 43S8A Hg line vs condenser temperature at several lamp currents. Intensity is plotted as percentage of intensity at 50° condenser temperature.

F. 4
F. 4

Simplified circuit diagram of the Raman source unit.

F. 5
F. 5

Photo of the Raman source.

Tables (1)

Tables Icon

Table I Comparative data on lamps for Raman spectroscopy.