The effect of compressing powdered samples on their diffuse reflectance infrared spectra is discussed. The scattering coefficient decreases with applied pressure, the magnitude of the increase being dependent on the nature of the sample. For pure powdered organic samples, such as caffeine, the increase in f(R<sub>∞</sub>) can be dramatic. By subjecting powdered samples to a pressure which is not enough to cause them to become transparent, the packing density becomes more uniform and band intensities become more reproducible. The relative intensity of neighboring bands in any region of the spectrum does not change appreciably with applied pressure.

PDF Article

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription