The recent review by FerraroJ. R. and BasileL. J., Appl. Spectrosc.28, 505 (1974) gives a survey of high pressure spectral techniques, including the diamond anvil cell, and contains a bibliography of applications.
2.
WeirC.BlockS., and PiermariniG., J. Res. Natl. Bur. Std. (U.S.)69C, 275 (1965); BraschJ. W., Spectrochim. Acta21, 1183 (1965); FerraroJ. R. and QuattrochiA., Appl. Spectrosc.24, 102 (1971).
3.
Ref. 1 discusses the internal standards which have been proposed as pressure calibrants.
4.
FishmanE. and DrickamerH. G., J. Chem. Phys.24, 548 (1956).
5.
ChristianS. D.GrundnesJ., and KlaboeP., J. Am. Chem. Soc.97, 3864 (1975).
6.
ChristianS. D.GrundnesJ., and KlaboeP., J. Chem. Phys. in press.
7.
The solubility of methanol in CS2 is limited and at moderate pressures some methanol may be lost from the solution phase. For sample thicknesses less than 0.15 mm it is probably desirable to use other compounds for which frequency vs pressure data are available.
8.
Applied pressure is defined here as the force applied to the diamonds (inferred from the spring length and force constant) divided by the area of the small diamond face.
9.
By using a measuring microscope, we have been able to determine changes in sample thickness to a precision of better than 0.01 mm. In this procedure, the change in distance between the outer faces of the two diamonds is determined after each change in spring length. We have used this technique to estimate changes in sample volume, and hence pressure, for samples for which infrared frequency vs pressure calibrations are not available.
10.
Weir and co-workers (Ref. 2) have also commented that very thick spacers are not suitable for high pressure studies.
11.
BraschJ. W., J. Chem. Phys.43, 3473 (1965); ChristianS. D.GrundnesJ., and KlaboeP., unpublished work.
