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Energy-level diagram showing the states involved in Raman spectra. Raman spectroscopy (/ ˈ r ɑː m ən /) (named after physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. [1]
The SPC file format is a file format in which all kinds of spectroscopic data, including among others infrared spectra, Raman spectra and UV/VIS spectra. The format can be regarded as a database with records of variable length and each record stores a different kind of data (instrumental information, information on one spectrum of a dataset ...
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
This file is a work of a U.S. Army soldier or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government , it is in the public domain in the United States.
For example, the rotational constant for the ground state is written as ′ ′, and that of the excited state as ′. Also, these constants are expressed in the molecular spectroscopist's units of cm −1 . so that B {\displaystyle B} in this article corresponds to B ¯ = B / h c {\displaystyle {\bar {B}}=B/hc} in the definition of rotational ...
A Raman band whose depolarization ratio is less than 0.75 is called a polarized band, and a band with a depolarization ratio equal to or greater than 0.75 is called a depolarized band. [4] [5] For a spherical top molecule in which all three axes are equivalent, symmetric vibrations have Raman spectral bands which are completely polarized (ρ = 0).
The spectrum of intensity differences recorded over a range of wavenumbers reveals information about chiral centres in the sample molecule. Raman optical activity can be observed in a number of forms, depending on the polarization of the incident and the scattered light.
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