A beam condenser for infrared spectrophotometers
Richard C. Brandt
The design and performance of a beam condenser for ir spectrophotometers such as the Beckman model IR-11 is described. The instrument has an image size of 4 mm X 8 mm and permits the use of samples mounted in the tail of a cryostat whose outside dimension is as large as 7 cm square. Applications to negative light flux spectroscopy are described, in particular, the direct measurement of the longitudinal optical frequency of lattice vibration for AgBr and AgCl. © 1969 Optical Society of America.
Materials
Curve 1
Temperature K: 7.5
Wavelength Range, µm: 67.1-83.8
Geometry θ θ' ω: ~45°-45°
Composition (weight percent), Specifications, and Remarks: 1 µm thick; evaporated on silver substrate (0.2 µm thick); aluminized mirror reference standard.