Krishnan, R. S. published an article in 1945, the title of the article was Raman spectra of the second order in crystals. I. Calcite.Recommanded Product: 452-75-5 And the article contains the following content:
cf. C.A. 40, 5142.9. The importance of the second-order Raman spectra of crystals in providing information regarding the dynamical and optical properties of crystals is emphasized. The first- and second-order Raman spectra of calcite are photographed with Hg resonance radiation (λ 2536.5 A.). The frequency shifts and widths of the five lines of the first-order spectrum are accurately measured. The second-order spectrum is composed of 11 lines of varying intensity and width, some of which appear also in the infrared spectrum with very nearly the same ν. The frequencies have been assigned as some of the octaves and allowed combinations of the fundamental νν of the calcite lattice. The experimental process involved the reaction of 4-Chloro-2-fluorotoluene(cas: 452-75-5).Recommanded Product: 452-75-5
4-Chloro-2-fluorotoluene(cas:452-75-5) belongs to chlorides. Alkanes and aryl alkanes may be chlorinated under free radical conditions, with UV light. However, the extent of chlorination is difficult to control. Aryl chlorides may be prepared by the Friedel-Crafts halogenation, using chlorine and a Lewis acid catalyst. Recommanded Product: 452-75-5
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics