Abstract

On account of the relatively small amount of energy emitted from sources in the wave-length region beyond 15μ, stray energy of short wave-length from the source becomes a considerable proportion of the energy indicated by the detecting system. By use of a reflection filter of LiF, this stray radiation is greatly reduced.

The infra-red spectra of cyclopentane, methylcyclopentane, ethylcyclopentane, and isopropylcyclopentane have been measured and each has a characteristic spectrum, which can be used in analysis.

Also, the spectra of cyclohexane, methylcyclohexane, ethylcyclohexane, and secondary butylcyclohexane have been measured and a number of bands which are characteristic of these substances have been observed.

© 1947 Optical Society of America

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References

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  1. C. Schaefer and F. Matossi, Das Ultrarote Spectrum (Julius Springer Verlag, Berlin, 1930).
    [CrossRef]
  2. A. Borden and E. F. Barker, J. Chem. Phys. 6, 61 (1938).
    [CrossRef]
  3. Arthur Schuster, Astrophys. J. 21, 197 (1921).
    [CrossRef]
  4. Earle K. Plyler, Ralph Stair, and Curtis J. Humphreys, J. Research Nat. Bur. Stand. 38, 211 (1947).
    [CrossRef]

1947 (1)

Earle K. Plyler, Ralph Stair, and Curtis J. Humphreys, J. Research Nat. Bur. Stand. 38, 211 (1947).
[CrossRef]

1938 (1)

A. Borden and E. F. Barker, J. Chem. Phys. 6, 61 (1938).
[CrossRef]

1921 (1)

Arthur Schuster, Astrophys. J. 21, 197 (1921).
[CrossRef]

Barker, E. F.

A. Borden and E. F. Barker, J. Chem. Phys. 6, 61 (1938).
[CrossRef]

Borden, A.

A. Borden and E. F. Barker, J. Chem. Phys. 6, 61 (1938).
[CrossRef]

Humphreys, Curtis J.

Earle K. Plyler, Ralph Stair, and Curtis J. Humphreys, J. Research Nat. Bur. Stand. 38, 211 (1947).
[CrossRef]

Matossi, F.

C. Schaefer and F. Matossi, Das Ultrarote Spectrum (Julius Springer Verlag, Berlin, 1930).
[CrossRef]

Plyler, Earle K.

Earle K. Plyler, Ralph Stair, and Curtis J. Humphreys, J. Research Nat. Bur. Stand. 38, 211 (1947).
[CrossRef]

Schaefer, C.

C. Schaefer and F. Matossi, Das Ultrarote Spectrum (Julius Springer Verlag, Berlin, 1930).
[CrossRef]

Schuster, Arthur

Arthur Schuster, Astrophys. J. 21, 197 (1921).
[CrossRef]

Stair, Ralph

Earle K. Plyler, Ralph Stair, and Curtis J. Humphreys, J. Research Nat. Bur. Stand. 38, 211 (1947).
[CrossRef]

Astrophys. J. (1)

Arthur Schuster, Astrophys. J. 21, 197 (1921).
[CrossRef]

J. Chem. Phys. (1)

A. Borden and E. F. Barker, J. Chem. Phys. 6, 61 (1938).
[CrossRef]

J. Research Nat. Bur. Stand. (1)

Earle K. Plyler, Ralph Stair, and Curtis J. Humphreys, J. Research Nat. Bur. Stand. 38, 211 (1947).
[CrossRef]

Other (1)

C. Schaefer and F. Matossi, Das Ultrarote Spectrum (Julius Springer Verlag, Berlin, 1930).
[CrossRef]

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Figures (13)

F. 1
F. 1

The effect on the radiant energy between 21 and 25μ caused by interposing an opaque shutter and shutters of LiF and CaF2.

F. 2
F. 2

A plate of LiF has been used instead of the aluminum mirror. The other conditions the same as in Fig. 1, except a shutter of AgCl has been added.

F. 3
F. 3

The reflection of LiF and CaF2 in the infrared. The percent reflection is relative to the reflection of an aluminum mirror.

F. 4
F. 4

The infra-red absorption band of liquid cyclopentane. Cell thicknesses were 0.2 mm and 1.25 mm.

F. 5
F. 5

The infra-red absorption band of cyclopentane vapor at 18.31μ for a cell of 140 cm, saturated at room temperature.

F. 6
F. 6

The infra-red absorption bands of liquid methylcyclopentane for a cell thickness of 1.25 mm.

F. 7
F. 7

The spectrum of liquid ethylcyclopentane showing bands at 18.31, 20.0 and 23.41μ.

F. 8
F. 8

The absorption spectrum of liquid isopropylcyclopentane.

F. 9
F. 9

The infra-red absorption spectrum of liquid cyclohexane for a cell 1.25 mm in thickness.

F. 10
F. 10

The infra-red absorption band of cyclohexane in the vapor state at 19.12μ for a cell of 140 cm, filled with saturated vapor at room temperature,

F. 11
F. 11

The absorption bands of liquid methylcyclohexane for a cell with thickness of 1.25 mm.

F. 12
F. 12

The absorption bands of liquid ethylcyclohexane.

F. 13
F. 13

The infra-red absorption spectrum of liquid sec-butylcyclohexane.

Tables (1)

Tables Icon

Table I Location of infra-red absorption bands.