Ultrafast rotational anisotropy measurements: unidirectional detection
Апстракт
Unidirectional signal detection in time-resolved rotational anisotropy experiments has been known to affect the time zero and time infinity (persistent alignment) values because these measurements can overestimate the parallel or perpendicular components of the signal. Here we demonstrate that the well-known expression for obtaining the rotational anisotropy, a quantity that is typically calculated to measure the alignment, rotational energy, or rotational constants of molecules, is not applicable for some of the most common experimental configurations. We report new formulations that take into account different unidirectional detection schemes and the f-number of the collection optics. Femtosecond time-resolved anisotropy measurements on iodine vapor were obtained, with typical right-angle detection, to illustrate how the new expression corresponding to this configuration yields the expected time zero and time infinity values; Fits to the observed anisotropy are shown to provide quant...itatively accurate results.
Извор:
Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 1999, 103, 16, 2912-2916
DOI: 10.1021/jp9845064
ISSN: 1089-5639
WoS: 000079933700002
Scopus: 2-s2.0-0032674057
Колекције
Институција/група
VinčaTY - JOUR AU - Brown, EJ AU - Pastirk, Igor AU - Dantus, M PY - 1999 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2244 AB - Unidirectional signal detection in time-resolved rotational anisotropy experiments has been known to affect the time zero and time infinity (persistent alignment) values because these measurements can overestimate the parallel or perpendicular components of the signal. Here we demonstrate that the well-known expression for obtaining the rotational anisotropy, a quantity that is typically calculated to measure the alignment, rotational energy, or rotational constants of molecules, is not applicable for some of the most common experimental configurations. We report new formulations that take into account different unidirectional detection schemes and the f-number of the collection optics. Femtosecond time-resolved anisotropy measurements on iodine vapor were obtained, with typical right-angle detection, to illustrate how the new expression corresponding to this configuration yields the expected time zero and time infinity values; Fits to the observed anisotropy are shown to provide quantitatively accurate results. T2 - Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory T1 - Ultrafast rotational anisotropy measurements: unidirectional detection VL - 103 IS - 16 SP - 2912 EP - 2916 DO - 10.1021/jp9845064 ER -
@article{ author = "Brown, EJ and Pastirk, Igor and Dantus, M", year = "1999", abstract = "Unidirectional signal detection in time-resolved rotational anisotropy experiments has been known to affect the time zero and time infinity (persistent alignment) values because these measurements can overestimate the parallel or perpendicular components of the signal. Here we demonstrate that the well-known expression for obtaining the rotational anisotropy, a quantity that is typically calculated to measure the alignment, rotational energy, or rotational constants of molecules, is not applicable for some of the most common experimental configurations. We report new formulations that take into account different unidirectional detection schemes and the f-number of the collection optics. Femtosecond time-resolved anisotropy measurements on iodine vapor were obtained, with typical right-angle detection, to illustrate how the new expression corresponding to this configuration yields the expected time zero and time infinity values; Fits to the observed anisotropy are shown to provide quantitatively accurate results.", journal = "Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory", title = "Ultrafast rotational anisotropy measurements: unidirectional detection", volume = "103", number = "16", pages = "2912-2916", doi = "10.1021/jp9845064" }
Brown, E., Pastirk, I.,& Dantus, M.. (1999). Ultrafast rotational anisotropy measurements: unidirectional detection. in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 103(16), 2912-2916. https://doi.org/10.1021/jp9845064
Brown E, Pastirk I, Dantus M. Ultrafast rotational anisotropy measurements: unidirectional detection. in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory. 1999;103(16):2912-2916. doi:10.1021/jp9845064 .
Brown, EJ, Pastirk, Igor, Dantus, M, "Ultrafast rotational anisotropy measurements: unidirectional detection" in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 103, no. 16 (1999):2912-2916, https://doi.org/10.1021/jp9845064 . .