The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.
Simple, Versatile Liquid Nitrogen Cryostat for Raman Studies
Volume 46, Number 10 (Oct. 1992) Page 1590-1592
Yue, Kwok To; Feng, Zhe Chuan; Perkowitz, Sidney; Puckett, Bud
Resonance Raman studies can often benefit from decreased sample temperature. With biological samples like frozen protein solutions, the spectral peaks are significantly narrowed at liquid nitrogen temperature due to the reduced molecular motion. Lowering the temperature can also minimize protein denaturation from local heating by the exciting laser beam. Semiconductors and their superlattices are another class of materials where Raman measurements often must be made at low temperatures. For many such samples the Raman features are very weak or not observable at room temperature; some mode intensities have a strong temperature dependence, and some modes are active only at low temperature. It is significant that most, if not all, of the features can be observed at liquid nitrogen temperatures, even though published reports often use lower temperatures requiring the more expensive and cumbersome liquid helium.