Comment on ‘‘IR lines broadened by chemical exchange’’
نویسندگان
چکیده
منابع مشابه
Narrowing of protein NMR spectral lines broadened by chemical exchange.
Broadening of spectral lines is a signature of chemical exchange phenomena on microsecond to millisecond time scales but has deleterious effects on spectral resolution and sensitivity. A multipulse method based on chemical shift scaling that reduces chemical exchange broadening during frequency-encoding periods of liquid-state multidimensional NMR experiments is described. The proposed scheme u...
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Stark broadened lines of the hydrogen Brackett series are computed for the conditions of stellar atmospheres and circumstellar envelopes. The computation is performed within the Model Micro eld Method, which includes the ion dynamic e ects and makes the bridge between the impact limit at low density and the static limit at high density and in the line wings. The computation gives the area norma...
متن کاملChemical exchange 2D IR of hydrogen-bond making and breaking.
The involvement of chemical exchange in 2D IR heterodyne echo spectroscopy is characterized through the hydrogen-bond exchange between CH3OH and the CN of CH3CN. The exchange dynamics on the hydrogen-bond potential surfaces associated with different quantum states of the high-frequency CN stretching mode contributes to strong cross peaks between CN groups in two different chemical configuration...
متن کاملInfluence of correlated collisions on Stark-broadened lines in plasmas.
An investigation of spectral line broadening in plasmas is carried out within a kinetic-theory approach, based on the Bogoliubov-Born-Green-Kirkwood-Yvon (BBGKY) hierarchy. The model employs a resummation procedure to account for correlated emitter-perturber collisions. Applications to hydrogen lines indicate that such collisions strongly affect the width and the shape in the core region. This ...
متن کاملLineshapes of spin exchange broadened EPR spectra.
An unexplained residual in the fits of theoretical and experimental spectra of exchange broadened nitroxide spin probes reported by Robinson et al. [J. Magn. Reson. 138 (1999) 199] is shown to be understood by inclusion of theoretically predicted lineshape changes into the fitting routine. These lineshape changes provide an additional estimate of the spin exchange frequency that is independent ...
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ژورنال
عنوان ژورنال: The Journal of Chemical Physics
سال: 1981
ISSN: 0021-9606,1089-7690
DOI: 10.1063/1.441479