Abstract

A relative transmission attachment is described for automatically recording spectra from 210 to 2700 mμ using a Beckman Model DU quartz spectrophotometer. The attachment requires the use of only one rotating mirror, detector, amplifier, and commutator along with two tuned rectifiers. The ratio of sample to reference beam intensities is traced on a high speed recorder. A slit servo operated from the reference signal maintains a reasonably constant reference signal. Representative curves showing the performance of the instrument are reproduced. The applications of differential recording are discussed.

© 1952 Optical Society of America

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References

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  1. Kaye, Canon, and Devaney, J. Opt. Soc. Am. 41, 658 (1951).
    [Crossref]
  2. Van Zandt Williams, Appl. Spectroscopy 6, 14 (1951).
    [Crossref]
  3. T. Coor and D. C. Smith, Rev. Sci. Instr. 18, 173 (1947).
    [Crossref]
  4. J. L. Hales, J. Sci. Instr. 26, 359 (1949).
    [Crossref]
  5. A. Savitsky and R. S. Halford, Rev. Sci. Instr. 21, 203 (1950).
    [Crossref]
  6. Hornig, Hyde, and Adcock, J. Opt. Soc. Am. 40, 497 (1950).
    [Crossref]
  7. G. F. Lothian, Absorption Spectrophotometry (Hilger and Watts, Ltd., London, 1949), p. 178.
  8. Benning, Ebert, and Irwin, Anal. Chem. 19, 867 (1947).
    [Crossref]

1951 (2)

Kaye, Canon, and Devaney, J. Opt. Soc. Am. 41, 658 (1951).
[Crossref]

Van Zandt Williams, Appl. Spectroscopy 6, 14 (1951).
[Crossref]

1950 (2)

A. Savitsky and R. S. Halford, Rev. Sci. Instr. 21, 203 (1950).
[Crossref]

Hornig, Hyde, and Adcock, J. Opt. Soc. Am. 40, 497 (1950).
[Crossref]

1949 (1)

J. L. Hales, J. Sci. Instr. 26, 359 (1949).
[Crossref]

1947 (2)

Benning, Ebert, and Irwin, Anal. Chem. 19, 867 (1947).
[Crossref]

T. Coor and D. C. Smith, Rev. Sci. Instr. 18, 173 (1947).
[Crossref]

Adcock,

Benning,

Benning, Ebert, and Irwin, Anal. Chem. 19, 867 (1947).
[Crossref]

Canon,

Coor, T.

T. Coor and D. C. Smith, Rev. Sci. Instr. 18, 173 (1947).
[Crossref]

Devaney,

Ebert,

Benning, Ebert, and Irwin, Anal. Chem. 19, 867 (1947).
[Crossref]

Hales, J. L.

J. L. Hales, J. Sci. Instr. 26, 359 (1949).
[Crossref]

Halford, R. S.

A. Savitsky and R. S. Halford, Rev. Sci. Instr. 21, 203 (1950).
[Crossref]

Hornig,

Hyde,

Irwin,

Benning, Ebert, and Irwin, Anal. Chem. 19, 867 (1947).
[Crossref]

Kaye,

Lothian, G. F.

G. F. Lothian, Absorption Spectrophotometry (Hilger and Watts, Ltd., London, 1949), p. 178.

Savitsky, A.

A. Savitsky and R. S. Halford, Rev. Sci. Instr. 21, 203 (1950).
[Crossref]

Smith, D. C.

T. Coor and D. C. Smith, Rev. Sci. Instr. 18, 173 (1947).
[Crossref]

Williams, Van Zandt

Van Zandt Williams, Appl. Spectroscopy 6, 14 (1951).
[Crossref]

Anal. Chem. (1)

Benning, Ebert, and Irwin, Anal. Chem. 19, 867 (1947).
[Crossref]

Appl. Spectroscopy (1)

Van Zandt Williams, Appl. Spectroscopy 6, 14 (1951).
[Crossref]

J. Opt. Soc. Am. (2)

J. Sci. Instr. (1)

J. L. Hales, J. Sci. Instr. 26, 359 (1949).
[Crossref]

Rev. Sci. Instr. (2)

A. Savitsky and R. S. Halford, Rev. Sci. Instr. 21, 203 (1950).
[Crossref]

T. Coor and D. C. Smith, Rev. Sci. Instr. 18, 173 (1947).
[Crossref]

Other (1)

G. F. Lothian, Absorption Spectrophotometry (Hilger and Watts, Ltd., London, 1949), p. 178.

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Figures (8)

Fig. 1
Fig. 1

Schematic diagram of the optics of the modified Beckman DU spectrophotometer.

Fig. 2
Fig. 2

Photograph of the sample compartment.

Fig. 3
Fig. 3

Wiring diagram of the rectifier chassis.

Fig. 4
Fig. 4

Energy curve for the lead sulfide detector and tungsten lamp operated at 3.4 amp and 4.8 v.

Fig. 5
Fig. 5

Absorption curve for a Corning didymium filter No. 1–60 obtained at high speed using the lead sulfide detector and tungsten lamp operated at 3.4 amp and 4.8 v.

Fig. 6
Fig. 6

Relative transmission curve for methylene chloride: [A] pure and [B, C, D] diluted in carbon tetrachloride.

Fig. 7
Fig. 7

Relative transmission curve for chloroform: [A] pure and [B, C, D] diluted in carbon tetrachloride.

Fig. 8
Fig. 8

Differential spectral curve for methylene chloride in chloroform.

Tables (2)

Tables Icon

Table I Circuit values for Fig. 3.a

Tables Icon

Table II Slit width versus wavelength [air reference].