Abstract
DFTS has a number of advantages over power FTS, one of which is its great sensitivity, under suitable conditions, to weak spectral features. This has previously been demonstrated with measurements on a wide range of single crystals of high purity. In this paper we demonstrate this advantage for an imperfect crystal, in this case KBr containing Cl impurity. FIR reflection DFTS performed on a sample at room temperature reveals a gap mode due to the Cl impurity at 95 cm −1, together with absorption in the range 50–200 cm −1 arising from lattice strain, with peaks which correspond to features in the one-phonon density of states of KBr. With the sample at room temperature these features are not observable using either reflection or transmission FTS with the same signal-to-noise ratio, although similar features have been observed by transmission FTS in samples rendered transparent by cooling to liquid N 2 temperature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
