Abstract

Indirect studies in the structure of coal and related carbonaceous materials are made through spectral studies of chars of model compounds. Temperature effects are demonstrated; the higher the temperature, or the longer the pyrolysis time, the higher the rank of coal that the char spectrum resembles. Charring of model compounds with and without oxygen present permits the assignment of some infrared bands of chars to oxygenated structures. Chars prepared from isotope-labeled compounds also permit the assignment of spectral bands through observation of isotopic shifts.

© 1963 Optical Society of America

Infrared Spectra of Coal and Carbohydrate Chars

R. A. Friedel and M. G. Pelipetz
J. Opt. Soc. Am. 43(11) 1051-1052 (1953)

The Observation of Extraphotographic Infrared Atomic Emission Spectra

Curtis J. Humphreys and Edward Paul
Appl. Opt. 2(7) 691-698 (1963)

Coblentz’ Contribution to Infrared Spectroscopy

R. Norman Jones
Appl. Opt. 2(11) 1090-1097 (1963)

Use of Electrodeless Discharge Lamps in the Analysis of Atomic Spectra

Earl F. Worden, Ralph G. Gutmacher, and John G. Conway
Appl. Opt. 2(7) 707-713 (1963)

Computed Transmission Spectra for 27-Micron H₂O Band

David M. Gates, Robert F. Calfee, and David W. Hansen
Appl. Opt. 2(11) 1117-1122 (1963)