Abstract

<p>An improved infrared microspectrometer is described. A figure of performance or merit for infrared spectrometers using certain types of specimens is suggested. An experimental value is given for this performance figure for the instrument now in use in our laboratory. The increased performance of the microspectrometer may be observed in the spectral data shown for typical specimens.</p><p>Spectral resolving power and sample size requirements for infrared microspectroscopy are considered for typical organic chemical substances. It now appears that for many applications the limiting factor on sample size is the difficulty in the preparation and handling of the sample rather than the performance of the instrument.</p>

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  1. Blout, Bird, and Grey, (a) J. Opt. Soc. Am. 39, 1052(A) (1949); (b) Ibid. 40, 304 (1950).
  2. Barer, Cole, and Thompson, Nature 163, 198 (1949).
  3. D. L. Wood, Rev. Sci. Instr. 21, 764 (1950).
  4. It is recognized that with such a system all the radiation from the source is concentrated on the sample and that thermal effects may occur. In our work, however, we have experienced no difficulty from heating of the samples by the source, possibly because they are mounted on silver chloride disks, which in turn rest on a silver support. With low melting (<45°C) crystals, it may be undesirable to irradiate with the unchopped beam for long times. The energy content of the radiation and the ease of construction and manipulation with the "microscope-preceding-monochromator" arrangement would seem to warrant its use except in the special cases where the arrangement generally used in ultraviolet microspectroscopy (monochromator-preceding-microscope) might be indicated.
  5. M. J. E. Golay, Rev. Sci. Instr. 18, 347, 357 (1947).
  6. Other cases will be considered by R. Clark Jones in a forthcoming publication.
  7. R. Clark Jones, J. Opt. Soc. Am. 39, 344 (1949).
  8. C. S. Rupert and J. Strong, J. Opt. Soc. Am. 40, 455–59 (1950).
  9. D. S. Grey, J. Opt. Soc. Am. 41, 183–92 (1951).
  10. Designed by D. S. Grey and constructed by Bausch and Lomb Optical Company.

Golay, M. J. E.

M. J. E. Golay, Rev. Sci. Instr. 18, 347, 357 (1947).

Grey, D. S.

D. S. Grey, J. Opt. Soc. Am. 41, 183–92 (1951).

Jones, R. Clark

R. Clark Jones, J. Opt. Soc. Am. 39, 344 (1949).

Rupert, C. S.

C. S. Rupert and J. Strong, J. Opt. Soc. Am. 40, 455–59 (1950).

Strong, J.

C. S. Rupert and J. Strong, J. Opt. Soc. Am. 40, 455–59 (1950).

Wood, D. L.

D. L. Wood, Rev. Sci. Instr. 21, 764 (1950).

Other

Blout, Bird, and Grey, (a) J. Opt. Soc. Am. 39, 1052(A) (1949); (b) Ibid. 40, 304 (1950).

Barer, Cole, and Thompson, Nature 163, 198 (1949).

D. L. Wood, Rev. Sci. Instr. 21, 764 (1950).

It is recognized that with such a system all the radiation from the source is concentrated on the sample and that thermal effects may occur. In our work, however, we have experienced no difficulty from heating of the samples by the source, possibly because they are mounted on silver chloride disks, which in turn rest on a silver support. With low melting (<45°C) crystals, it may be undesirable to irradiate with the unchopped beam for long times. The energy content of the radiation and the ease of construction and manipulation with the "microscope-preceding-monochromator" arrangement would seem to warrant its use except in the special cases where the arrangement generally used in ultraviolet microspectroscopy (monochromator-preceding-microscope) might be indicated.

M. J. E. Golay, Rev. Sci. Instr. 18, 347, 357 (1947).

Other cases will be considered by R. Clark Jones in a forthcoming publication.

R. Clark Jones, J. Opt. Soc. Am. 39, 344 (1949).

C. S. Rupert and J. Strong, J. Opt. Soc. Am. 40, 455–59 (1950).

D. S. Grey, J. Opt. Soc. Am. 41, 183–92 (1951).

Designed by D. S. Grey and constructed by Bausch and Lomb Optical Company.

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