Abstract

Crystal-optic reflectance data from the literature, reflectance measurements at near-normal incidence of pressed powders and from faces of crystals between 1500 and 200 cm−1 are compared. Reststrahlen bands of more than twenty inorganic substances, ranging from sodium nitrate to quartz and magnesium oxide, were scrutinized. Differences among the reflectances of various pellets pressed from ground crystals, microcrystals (size below 20 μm), and smokes (smaller than 1 μm) of the same substance were mostly negligible. Factor of 3 deviations from nominal pressure (11 kbar) also were not significant. Measured powder reflectances agree with averaged crystal-optic reflectances if the low density of powders of harder substances is taken into account (as was partially proved by increasing the pressure to 110 kbar). Mixed powders often showed serious weakening of some nonoverlapping component bands; overlapping bands may become enhanced or weakened. This severely limits the usefulness of the reflection method to obtain information on the composition of mixtures. Band shifts, when they occur, are small. Analogies to two-mode behavior of mixed crystals in lattice-disorder studies may exist. The results cannot be explained by any of the effective medium mixing rules or absorption index averaging of classical oscillator theory.

© 1983 Optical Society of America

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1981

R. B. Singer, J. Geophys. Res. 86, 7967 (1981).
[CrossRef]

R. Deju, A. Aszodi, R. Buciu, C. N. Turcanu, Rev. Roum. Phys. 26, 397 (1981).

V. P. Tomaselli, R. Rivera, D. C. Edewaard, K. D. Moeller, Appl. Opt. 20, 3961 (1981).
[CrossRef] [PubMed]

1980

1979

1978

1977

P. Dawson, M. M. Hargreave, G. R. Wilkinson, Spectrochim. Acta 33, 83 (1977).
[CrossRef]

C. G. Granqvist, O. Hunderi, Phys. Rev. 16, 3513 (1977); D. E. Aspnes, Phys. Rev. 25, 1358 (1982).
[CrossRef]

1976

O. B. Toon, J. B. Pollack, B. N. Khare, J. Geophys. Res. 81, 5733 (1976).
[CrossRef]

R. Frech, Phys. Rev. 13, 2342 (1976); H. Nichols, R. Frech, J. Chem. Phys. 69, 4995 (1978); J. Chem. Phys. 68, 4983 (1978).
[CrossRef]

1974

F. Meserole, J. C. Decius, R. E. Carlson, Spectrochim. Acta Part A 30, 2179 (1974).
[CrossRef]

1973

J. C. Decius, R. Frech, P. Brüesch, J. Chem. Phys. 58, 4056 (1973).
[CrossRef]

L. S. Ivlev, S. I. Popova, Izv. Acad. Sci. USSR Atmos. Oceanic Phys. 9, 587 (1973).

1972

F. E. Volz, Appl. Opt. 11, 75 (1972); Appl. Opt. 12, 564 (1973).
[CrossRef] [PubMed]

1971

I. F. Chang, S. S. Mitra, Adv. Phys. 20, 359 (1971).
[CrossRef]

1970

R. Ruppin, R. Englman, Rep. Prog. Phys. 33, 149 (1970).
[CrossRef]

G. Andermann, E. Duesler, J. Opt. Soc. Am. 60, 53 (1970).
[CrossRef]

K. H. Hellwege, W. Lesch, M. Plihal, G. Schaack, Z. Phys. 232, 61 (1970).
[CrossRef]

1969

J. H. Fertel, C. H. Perry, Phys. Rev. 184, 874 (1969).
[CrossRef]

J. E. Conel, J. Geophys. Res. 74, 1614 (1969).
[CrossRef]

A. G. Emslie, T. P. Rooney, I. Coleman, G. Horlick, Appl. Opt. 8, 1639 (1969).
[CrossRef] [PubMed]

1968

1967

J. R. Aronson, A. G. Emslie, R. V. Allen, H. G. McLinden, J. Geophys. Res. 72, 687 (1967).
[CrossRef]

G. Andermann, D. A. Dows, Phys. Chem. Solids 28, 1307 (1967).
[CrossRef]

A. M. Vergnoux, M. R. Brunel, C.R. Acad. Sci. 265, 1097 (1967).

1966

E. A. Schatz, J. Opt. Soc. Am. 56, 389 (1966); J. Opt. Soc. Am. 57, 941 (1967).
[CrossRef]

J. R. Jasperse, A. Kahan, J. N. Plendl, S. S. Mitra, Phys. Rev. 146, 526 (1966).
[CrossRef]

1963

1962

C. L. Huffine, C. F. Bonilla, AIChE J. 8, 490 (1962).
[CrossRef]

W. G. Spitzer, R. C. Miller, D. A. Kleinman, L. E. Howarth, Phys. Rev. 126, 1710 (1962); A. S. Barker, J. J. Hopfield, Phys. Rev. 135, 1732 (1964).
[CrossRef]

1961

W. G. Spitzer, D. A. Kleinman, Phys. Rev. 121, 1324 (1961).
[CrossRef]

1960

D. A. Kleinman, W. G. Spitzer, Phys. Rev. 118, 110 (1960); Y. S. Chen, W. Shockley, G. L. Pearson, Phys. Rev. 151, 648 (1960).
[CrossRef]

1952

R. Newman, J. Chem. Phys. 20, 444 (1952); J. D. Axe, Phys. Rev. 167, 573 (1968); M. K. Barnoski, J. M. Ballantyne, Phys. Rev. 174, 946 (1968).
[CrossRef]

M. Hass, G. B. B. M. Sutherland, Proc. R. Soc. London Ser. A 236, 422 (1952); G. Schaack, Phys. kondens. Materie 1, 245 (1963).

1951

1933

R. B. Barnes, Phys. Rev. 43, 31 (1933); C. W. Bryant, J. Opt. Soc. Am. 24, 139 (1934).
[CrossRef]

1932

R. Pohlman, Z. Phys. 79, 394 (1932); R. Newman, R. S. Halford, J. Chem. Phys. 18, 1276 (1950).
[CrossRef]

1918

C. Schaefer, M. Schubert, Ann. Phys. 55, 577 (1918).
[CrossRef]

1916

C. Schaefer, M. Schubert, Ann. Phys. 50, 283 (1916).
[CrossRef]

Allen, R. V.

J. R. Aronson, A. G. Emslie, R. V. Allen, H. G. McLinden, J. Geophys. Res. 72, 687 (1967).
[CrossRef]

Andermann, G.

G. Andermann, E. Duesler, J. Opt. Soc. Am. 60, 53 (1970).
[CrossRef]

G. Andermann, D. A. Dows, Phys. Chem. Solids 28, 1307 (1967).
[CrossRef]

Aronson, J. R.

J. R. Aronson, A. G. Emslie, Appl. Opt. 19, 4128 (1980).
[CrossRef] [PubMed]

J. R. Aronson, A. G. Emslie, R. V. Allen, H. G. McLinden, J. Geophys. Res. 72, 687 (1967).
[CrossRef]

J. R. Aronson, A. G. Emslie, E. M. Smith, P. F. Strong, “Infrared Spectra of Lunar Soils and Related Optical Constants,” in Proceedings, Tenth Lunar Planet Science Conference (1979), pp. 1787–1795.

Aszodi, A.

R. Deju, A. Aszodi, R. Buciu, C. N. Turcanu, Rev. Roum. Phys. 26, 397 (1981).

Barnes, R. B.

R. B. Barnes, Phys. Rev. 43, 31 (1933); C. W. Bryant, J. Opt. Soc. Am. 24, 139 (1934).
[CrossRef]

Bennett, H. E.

Bonilla, C. F.

C. L. Huffine, C. F. Bonilla, AIChE J. 8, 490 (1962).
[CrossRef]

Brüesch, P.

J. C. Decius, R. Frech, P. Brüesch, J. Chem. Phys. 58, 4056 (1973).
[CrossRef]

Brunel, M. R.

A. M. Vergnoux, M. R. Brunel, C.R. Acad. Sci. 265, 1097 (1967).

Buciu, R.

R. Deju, A. Aszodi, R. Buciu, C. N. Turcanu, Rev. Roum. Phys. 26, 397 (1981).

Carlson, R. E.

F. Meserole, J. C. Decius, R. E. Carlson, Spectrochim. Acta Part A 30, 2179 (1974).
[CrossRef]

Chang, I. F.

I. F. Chang, S. S. Mitra, Adv. Phys. 20, 359 (1971).
[CrossRef]

Coleman, I.

Conel, J. E.

J. E. Conel, J. Geophys. Res. 74, 1614 (1969).
[CrossRef]

Coveney, R. M.

Dawson, P.

P. Dawson, M. M. Hargreave, G. R. Wilkinson, Spectrochim. Acta 33, 83 (1977).
[CrossRef]

Decius, J. C.

F. Meserole, J. C. Decius, R. E. Carlson, Spectrochim. Acta Part A 30, 2179 (1974).
[CrossRef]

J. C. Decius, R. Frech, P. Brüesch, J. Chem. Phys. 58, 4056 (1973).
[CrossRef]

J. C. Decius, R. M. Hexter, Molecular Vibrations in Crystals (McGraw-Hill, New York, 1977).

Deju, R.

R. Deju, A. Aszodi, R. Buciu, C. N. Turcanu, Rev. Roum. Phys. 26, 397 (1981).

Dows, D. A.

G. Andermann, D. A. Dows, Phys. Chem. Solids 28, 1307 (1967).
[CrossRef]

Duesler, E.

Edewaard, D. C.

Egan, W. G.

W. G. Egan, T. Hilgeman, Appl. Opt. 19, 3724 (1980).
[CrossRef] [PubMed]

W. G. Egan, T. Hilgeman, Optical Properties of Inhomogeneous Materials (Academic, New York, 1979).

Emslie, A. G.

J. R. Aronson, A. G. Emslie, Appl. Opt. 19, 4128 (1980).
[CrossRef] [PubMed]

A. G. Emslie, T. P. Rooney, I. Coleman, G. Horlick, Appl. Opt. 8, 1639 (1969).
[CrossRef] [PubMed]

J. R. Aronson, A. G. Emslie, R. V. Allen, H. G. McLinden, J. Geophys. Res. 72, 687 (1967).
[CrossRef]

J. R. Aronson, A. G. Emslie, E. M. Smith, P. F. Strong, “Infrared Spectra of Lunar Soils and Related Optical Constants,” in Proceedings, Tenth Lunar Planet Science Conference (1979), pp. 1787–1795.

Englman, R.

R. Ruppin, R. Englman, Rep. Prog. Phys. 33, 149 (1970).
[CrossRef]

Fertel, J. H.

J. H. Fertel, C. H. Perry, Phys. Rev. 184, 874 (1969).
[CrossRef]

Frech, R.

R. Frech, Phys. Rev. 13, 2342 (1976); H. Nichols, R. Frech, J. Chem. Phys. 69, 4995 (1978); J. Chem. Phys. 68, 4983 (1978).
[CrossRef]

J. C. Decius, R. Frech, P. Brüesch, J. Chem. Phys. 58, 4056 (1973).
[CrossRef]

Granqvist, C. G.

C. G. Granqvist, O. Hunderi, Phys. Rev. 16, 3513 (1977); D. E. Aspnes, Phys. Rev. 25, 1358 (1982).
[CrossRef]

Hargreave, M. M.

P. Dawson, M. M. Hargreave, G. R. Wilkinson, Spectrochim. Acta 33, 83 (1977).
[CrossRef]

Hass, M.

M. Hass, G. B. B. M. Sutherland, Proc. R. Soc. London Ser. A 236, 422 (1952); G. Schaack, Phys. kondens. Materie 1, 245 (1963).

Hellwege, K. H.

K. H. Hellwege, W. Lesch, M. Plihal, G. Schaack, Z. Phys. 232, 61 (1970).
[CrossRef]

Hexter, R. M.

J. C. Decius, R. M. Hexter, Molecular Vibrations in Crystals (McGraw-Hill, New York, 1977).

Hilgeman, T.

W. G. Egan, T. Hilgeman, Appl. Opt. 19, 3724 (1980).
[CrossRef] [PubMed]

W. G. Egan, T. Hilgeman, Optical Properties of Inhomogeneous Materials (Academic, New York, 1979).

Horlick, G.

Howarth, L. E.

W. G. Spitzer, R. C. Miller, D. A. Kleinman, L. E. Howarth, Phys. Rev. 126, 1710 (1962); A. S. Barker, J. J. Hopfield, Phys. Rev. 135, 1732 (1964).
[CrossRef]

Huffine, C. L.

C. L. Huffine, C. F. Bonilla, AIChE J. 8, 490 (1962).
[CrossRef]

Hunderi, O.

C. G. Granqvist, O. Hunderi, Phys. Rev. 16, 3513 (1977); D. E. Aspnes, Phys. Rev. 25, 1358 (1982).
[CrossRef]

Hunt, G. R.

Ivlev, L. S.

L. S. Ivlev, S. I. Popova, Izv. Acad. Sci. USSR Atmos. Oceanic Phys. 9, 587 (1973).

Jasperse, J. R.

J. R. Jasperse, A. Kahan, J. N. Plendl, S. S. Mitra, Phys. Rev. 146, 526 (1966).
[CrossRef]

Jordan, R.

Kahan, A.

J. R. Jasperse, A. Kahan, J. N. Plendl, S. S. Mitra, Phys. Rev. 146, 526 (1966).
[CrossRef]

Keezer, R. C.

R. C. Keezer, G. Lucovsky, M. L. Slade, Solid State Commun. 6, 765 (1968).
[CrossRef]

Khare, B. N.

O. B. Toon, J. B. Pollack, B. N. Khare, J. Geophys. Res. 81, 5733 (1976).
[CrossRef]

Kleinman, D. A.

W. G. Spitzer, R. C. Miller, D. A. Kleinman, L. E. Howarth, Phys. Rev. 126, 1710 (1962); A. S. Barker, J. J. Hopfield, Phys. Rev. 135, 1732 (1964).
[CrossRef]

W. G. Spitzer, D. A. Kleinman, Phys. Rev. 121, 1324 (1961).
[CrossRef]

D. A. Kleinman, W. G. Spitzer, Phys. Rev. 118, 110 (1960); Y. S. Chen, W. Shockley, G. L. Pearson, Phys. Rev. 151, 648 (1960).
[CrossRef]

Leader, J. C.

Lesch, W.

K. H. Hellwege, W. Lesch, M. Plihal, G. Schaack, Z. Phys. 232, 61 (1970).
[CrossRef]

Lies, K.

Lucovsky, G.

R. C. Keezer, G. Lucovsky, M. L. Slade, Solid State Commun. 6, 765 (1968).
[CrossRef]

McLinden, H. G.

J. R. Aronson, A. G. Emslie, R. V. Allen, H. G. McLinden, J. Geophys. Res. 72, 687 (1967).
[CrossRef]

Meserole, F.

F. Meserole, J. C. Decius, R. E. Carlson, Spectrochim. Acta Part A 30, 2179 (1974).
[CrossRef]

Miller, R. C.

W. G. Spitzer, R. C. Miller, D. A. Kleinman, L. E. Howarth, Phys. Rev. 126, 1710 (1962); A. S. Barker, J. J. Hopfield, Phys. Rev. 135, 1732 (1964).
[CrossRef]

Mitra, S. S.

I. F. Chang, S. S. Mitra, Adv. Phys. 20, 359 (1971).
[CrossRef]

J. R. Jasperse, A. Kahan, J. N. Plendl, S. S. Mitra, Phys. Rev. 146, 526 (1966).
[CrossRef]

Moeller, K. D.

Newman, R.

R. Newman, J. Chem. Phys. 20, 444 (1952); J. D. Axe, Phys. Rev. 167, 573 (1968); M. K. Barnoski, J. M. Ballantyne, Phys. Rev. 174, 946 (1968).
[CrossRef]

Osborne, G.

Perry, C. H.

J. H. Fertel, C. H. Perry, Phys. Rev. 184, 874 (1969).
[CrossRef]

Plendl, J. N.

J. R. Jasperse, A. Kahan, J. N. Plendl, S. S. Mitra, Phys. Rev. 146, 526 (1966).
[CrossRef]

Plihal, M.

K. H. Hellwege, W. Lesch, M. Plihal, G. Schaack, Z. Phys. 232, 61 (1970).
[CrossRef]

Pohlman, R.

R. Pohlman, Z. Phys. 79, 394 (1932); R. Newman, R. S. Halford, J. Chem. Phys. 18, 1276 (1950).
[CrossRef]

Pollack, J. B.

O. B. Toon, J. B. Pollack, B. N. Khare, J. Geophys. Res. 81, 5733 (1976).
[CrossRef]

Popova, S. I.

L. S. Ivlev, S. I. Popova, Izv. Acad. Sci. USSR Atmos. Oceanic Phys. 9, 587 (1973).

Porteus, J. O.

Querry, M. R.

Rivera, R.

Rooney, T. P.

Ruppin, R.

R. Ruppin, R. Englman, Rep. Prog. Phys. 33, 149 (1970).
[CrossRef]

Schaack, G.

K. H. Hellwege, W. Lesch, M. Plihal, G. Schaack, Z. Phys. 232, 61 (1970).
[CrossRef]

Schaefer, C.

C. Schaefer, M. Schubert, Ann. Phys. 55, 577 (1918).
[CrossRef]

C. Schaefer, M. Schubert, Ann. Phys. 50, 283 (1916).
[CrossRef]

Schatz, E. A.

Schubert, M.

C. Schaefer, M. Schubert, Ann. Phys. 55, 577 (1918).
[CrossRef]

C. Schaefer, M. Schubert, Ann. Phys. 50, 283 (1916).
[CrossRef]

Simon, I.

Singer, R. B.

R. B. Singer, J. Geophys. Res. 86, 7967 (1981).
[CrossRef]

Slade, M. L.

R. C. Keezer, G. Lucovsky, M. L. Slade, Solid State Commun. 6, 765 (1968).
[CrossRef]

Smith, E. M.

J. R. Aronson, A. G. Emslie, E. M. Smith, P. F. Strong, “Infrared Spectra of Lunar Soils and Related Optical Constants,” in Proceedings, Tenth Lunar Planet Science Conference (1979), pp. 1787–1795.

Spitzer, W. G.

W. G. Spitzer, R. C. Miller, D. A. Kleinman, L. E. Howarth, Phys. Rev. 126, 1710 (1962); A. S. Barker, J. J. Hopfield, Phys. Rev. 135, 1732 (1964).
[CrossRef]

W. G. Spitzer, D. A. Kleinman, Phys. Rev. 121, 1324 (1961).
[CrossRef]

D. A. Kleinman, W. G. Spitzer, Phys. Rev. 118, 110 (1960); Y. S. Chen, W. Shockley, G. L. Pearson, Phys. Rev. 151, 648 (1960).
[CrossRef]

Strong, P. F.

J. R. Aronson, A. G. Emslie, E. M. Smith, P. F. Strong, “Infrared Spectra of Lunar Soils and Related Optical Constants,” in Proceedings, Tenth Lunar Planet Science Conference (1979), pp. 1787–1795.

Sutherland, G. B. B. M.

M. Hass, G. B. B. M. Sutherland, Proc. R. Soc. London Ser. A 236, 422 (1952); G. Schaack, Phys. kondens. Materie 1, 245 (1963).

Tomaselli, V. P.

Toon, O. B.

O. B. Toon, J. B. Pollack, B. N. Khare, J. Geophys. Res. 81, 5733 (1976).
[CrossRef]

Turcanu, C. N.

R. Deju, A. Aszodi, R. Buciu, C. N. Turcanu, Rev. Roum. Phys. 26, 397 (1981).

Vergnoux, A. M.

A. M. Vergnoux, M. R. Brunel, C.R. Acad. Sci. 265, 1097 (1967).

Vincent, R. K.

Volz, F. E.

F. E. Volz, Appl. Opt. 11, 75 (1972); Appl. Opt. 12, 564 (1973).
[CrossRef] [PubMed]

F. E. Volz, in Digest of Topical Meeting on Optical Phenomena Peculiar to Matter of Small Dimensions (Optical Society of America, Washington, D.C., 1980).

Wilkinson, G. R.

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Figures (25)

Fig. 1
Fig. 1

Electron micrographs of surface of pellet (lightly ground mixture of Na2SO2 and K2SO4) at different magnifications.

Fig. 2
Fig. 2

Reflectance of MgO: top curve crystal-optic28,29; lower curves pressed smoke and powders.

Fig. 3
Fig. 3

Reflectance of SrTiO3, crystal-optic30 and pressed powder.

Fig. 4
Fig. 4

Reflectance of NaClO3: left, crystal-optic data31; middle, powders and pressed crystals; right, fused and polished salt. Reproduced from Ref. 10 by persmission of the Optical Society of America.

Fig. 5
Fig. 5

Reflectance spectra of NaNO3: left, crystal-optic data,32,33 faces and cleaved plane; large inset, pressed powder and polished melt; small inset, small crystals, not pressed.

Fig. 6
Fig. 6

Calcium carbonate: left, crystal-optic reflectance33,34 and faces; inset, pressed powder, polished limestone,35 and marble. Reproduced with additions from Ref. 10 by permission of the Optical Society of America.

Fig. 7
Fig. 7

Quasi-uniaxial reflectance of NaNO2: crystal-optic values37 and faces; inset, pressed powder and fused polished piece. See Fig. 15 for biaxial vibration at 200 cm−1. Reproduced from Ref. 10 by permission of the Optical Society of America.

Fig. 8
Fig. 8

Quartz: upper curves (solid lines) are crystal-optic data38 and (dashed) typical face spectra; low reflectance curves are for polished microcrystalline minerals, pressed powders of quartz and sandstone. For quartzite see Ref. 2.

Fig. 9
Fig. 9

Gypsum: left, crystal-optic, unpolarized,39,40 and cleavage planes; inset, powder reflectance. Band position and peak reflectance from polarized measurements40 are indicated.

Fig. 10
Fig. 10

Reflectance of Na2SO4: left, crystal-optic39 and faces of thenardite crystal (all unpolarized); center, same band for pressed crystals and powders; right, 600-cm−1 band, crystal face, and powder.

Fig. 11
Fig. 11

(a) Reflectance of BaSO4, crystal-optic,41 and pressed powders. (b) Reflectance of faces and cleavage plane, unpolarized radiation (dotted curve is for intermediate azimuth). Both figures also show absorption spectrum (compressed scale) in KBr.

Fig. 12
Fig. 12

K2SO4: left, faces and powder; middle, crystal-optic reflectance42; right, effect of variations of powder preparation.

Fig. 13
Fig. 13

Reflectance of NH4NO3, crystal faces and pressed powder. For polarized transmittance with saturated main bands see Ref. 43.

Fig. 14
Fig. 14

KClO3: left crystal faces; right powders.

Fig. 15
Fig. 15

Averaged crystal-optic reflectance37 in low-frequency band system (vibrations of nitrite ion) of NaNO2 compared with pressed-powder reflectance.

Fig. 16
Fig. 16

Reflectance of main bands of (a) NaNO3 and (b) NaClO3 mixed with different amounts of KBr, and (c) change of peak reflectance with weight fraction.

Fig. 17
Fig. 17

Reflectance of LiF and mixtures: right, upper heavy curves, crystal-optic25 and pressed needles (dashed), pressed fine powder (solid line) and fused, polished (dotted); lower thin curves, mixtures of LiF with sodium salts; inset, LiF–NaCl mixtures.

Fig. 18
Fig. 18

Reflectance of a 1:1 mix of calcite and barite powders (solid line) and of components.

Fig. 19
Fig. 19

Mixed pressed powders, Na2SO4 + Na2CO3; dotted, Na2CO3 powder; thin line, after recrystallization.

Fig. 20
Fig. 20

Reflectance of ammonium sulfate and sodium nitrate mix (3:1) and of components; dashed, recrystallizedsalts.

Fig. 21
Fig. 21

Reflectance of 1:1 mixtures (by weight) of quartz powder with different salt powders. Mixture reflectance is highest when component bands coincide.

Fig. 22
Fig. 22

Reflectance at 1000 cm−1 of pressed mixture of NaClO3 and activated carbon.

Fig. 23
Fig. 23

Left to right, reflectance from 900 to 1200 cm−1 of increasing mixing ratio of sulfate in talc (a white powdered magnesium silicate from Baker, No. 1-4100.

Fig. 24
Fig. 24

Comparison of reflectance of mixed GaAs–GaP crystal46 with that of mixed powder.

Fig. 25
Fig. 25

Fused quartz–NaNO3 mix to be compared with the corresponding mix (full line) of Fig. 21.

Tables (2)

Tables Icon

Table I Comparison of Crystal-Optic Reflectance(RC), Reflectance of Pressed Powder(Rp), and Expected Value (RM) for Orientation—Averaged Reflectance RC; the Penultimate Column Gives the Ratio Rp/RM; All Data are for the Peak of the Main Reststrahlen Band, Pressure 11 kbar (HP ≈ 33 kbar); Last Column Shows Number of Figure in which Compound is Presented

Tables Icon

Table II Details of Reflectance of 1:1 Mixes of NaNO3 and Na2SO4

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