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Wesley S Patterson - One of the best experts on this subject based on the ideXlab platform.
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high intensity argon Ion Laser jet photochemistry reactIons between transient species the additIon of diphenylcarbene to the photoenol of 2 methylbenzophenone
Journal of the American Chemical Society, 1992Co-Authors: Marshall R Wilson, Karlyn A Schnapp, Wesley S PattersonAbstract:In an effort to determine wether the recently developed technique of argon Ion Laser-jet irradiatIon can be effectively applied to this problem of transient-transient reactIons, we have examined the reactIon of diphenylcarbene with a photoenol.
A Pardo - One of the best experts on this subject based on the ideXlab platform.
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analysis and transitIon probabilities of the a 1σ x 1σ system of kh excited by the 4880 a line of the argon Ion Laser
Journal of Chemical Physics, 1998Co-Authors: J J Camacho, J M L Poyato, A Pardo, D ReymanAbstract:The fluorescence spectrum of KH induced by the 4880 A line of an argon Ion Laser has been analyzed. This work extends previous observatIons on potassium hydride in visible regIon by using this excitatIon line. Along with the principal fluorescence series for the A 1Σ+→X 1Σ+ band system, corresponding to the excitatIon transitIon, v′=7, J′=6←v″=0, J″=5, we analyzed a very interesting satellite rotatIonal and vibratIonal structure induced by collisIon. The radiative transitIon probabilities for the A 1Σ+→X 1Σ+ band system of KH have been calculated by using hybrid potential energy curves for the X 1Σ+ and A 1Σ+ states and transitIon dipole moment functIon from the radiative lifetimes of different vibratIonal levels (v′=5−22 in the A 1Σ+ state) reported by Giroud and Nedelec. The transitIon probabilities and lifetimes are in good agreement with the corresponding observed measurements usually within the experimental uncertainty. CollisIon-induced rotatIonal and vibratIonal energy transfer in the A 1Σ+ state h...
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fluorescence of na2 excited by the 4545 a line of the argon Ion Laser
Journal of Quantitative Spectroscopy & Radiative Transfer, 1996Co-Authors: J J Camacho, J M L Poyato, A M Polo, A PardoAbstract:Abstract The fluorescence spectrum of Na 2 induced by the blue 4545.05 A line of an argon Ion Laser has been observed and analysed for the first time. Four fluorescence series excited through the transitIons: v ′ = 20, J ′ = 51 ← v ″ = 2, J ″ = 50; v ′ = 27, J ′ = 71 ← v ″ = 4, J ″ = 71; v ′= 18, J ′ = 48 ← v ″ = 1, J ″ = 47 and v ′ = 17, J ′ = 58 ← v ″ = 0, J ″ = 57 were assigned in the B 1 II u → X 1 ∑ g + band system. The calculated radiative transitIon probabilities for the observed fluorescence series are in good agreement with measured relative intensities reported herein.
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analysis and transitIon probabilities of the b1πu x1σg system of na2 excited by the 5017 a line of the argon Ion Laser
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1996Co-Authors: J M L Poyato, J J Camacho, A M Polo, A PardoAbstract:Abstract The fluorescence spectrum of Na 2 induced by the 5017.16 A line of an argon Ion Laser has been analyzed. This work extends previous observatIons on Na 2 by using this excitatIon line. We have observed seven fluorescence series for the B 1 Π u → X 1 Σ g + band system corresponding to the excitatIon transitIons: ν ′ = 5, J ′ = 37 ← ν ″ = 6, J ″ = 38; ν ′ = 5, J ′ = 88 ← ν ″ = 5, J ″ = 87; ν ′ = 5, J ′ = 124 ← ν ″ = 3, J ″ = 125; ν ′ = 0, J ′ = 42 ← ν ″ = 2, J ″ = 43; ν ′ = 10, J ′ = 78 ← ν ″ = 9, J ″ = 77; ν ′ = 14, J ′ = 68 ← ν ″ = 12, J ″ = 68 and ν ′ = 15, J ′ = 58 ← ν ″ = 13, J ″ = 58. The latter four series are reported for the first time. The radiative transitIon probabilities for the observed fluorescence series are calculated by using hybrid Perturbed-Morse-Oscillator (PMO)-Rydberg-Klein-Rees (RKR)-long range potential energy curves for the B 1 Π u and X 1 Σ g + states and ab initio transitIon dipole moment functIon. Radiative lifetimes of the rovibratIonal levels of the upper state pumped by the Laser line have also been calculated. The transitIon probabilities and lifetimes are in good agreement with the corresponding observed measurements usually within the experimental uncertainty. From the rotatIonal satellite structure of some bands, collisIon-induced transitIon rates and average cross sectIons have been determined.
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radiative transitIon probabilities for the b 1πu x 1σg band system of na2 excited by the 4658 a line of the argon Ion Laser
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1995Co-Authors: J M L Poyato, J J Camacho, A M Polo, A PardoAbstract:Abstract The 4657.89 A line of a 12 W argon Ion Laser is used to excite the B 1 Π u a X 1 Σ g + fluorescence of Na2. Two new fluorescence Q series from B 1 Π u levels (v′ = 28, J′ = 55) and (v′ = 25, J′ = 3) originating from (v″ = 9, J″ = 55) and (v″ = 9, J″ = 3), respectively, are observed together with R-P series (Laser excitatIon: v′ = 17, J′ = 38 « v″ = 4, J″ = 39 ) known from earlier work. The absolute radiative transitIon probabilities and lifetimes are calculated from self-consistent hybrid Perturbed Morse Oscillator (PMO)-Rydberg-Klein-Rees (RKR) Long Range potential energy curves and ab initio transitIon dipole moment functIon. These calculated transitIon probabilities agree reasonably with our Laser-induced fluorescence results. Not only do the calculated Einstein A coefficients agree with measured relative fluorescence intensities, but also, when summed over final vibratIonal levels v″, give precise lifetimes.
Sarah Y Chang - One of the best experts on this subject based on the ideXlab platform.
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capillary electrophoresis of aminoglycosides with argon Ion Laser induced fluorescence detectIon
Journal of Chromatography A, 2008Co-Authors: Yungchi Wang, Sarah Y ChangAbstract:Abstract A new analytical method for aminoglycosides (kanamycin, bekanamycin, paromomycin and tobramycin) based on capillary electrophoretic separatIon and argon-Ion Laser-induced fluorescence detectIon has been developed. 6-Carboxyfluorescein succinimidyl ester (CFSE) was used for precolumn derivatizatIon of the non-fluorescent aminoglycosides. Optimal separatIon and detectIon were obtained with an electrophoretic buffer of 30 mM sodium borate (pH 9.0) and an air-cooled argon-Ion Laser (excitatIon at 488 nm, emissIon at 520 nm). The concentratIon limits of detectIon in aqueous solutIon were 3.9–8.2 nM. Combined with a simple cleanup procedure, this method can be applied to the determinatIon of aminoglycosides in human plasma. A calibratIon curve ranging from 0.15 to 30 μM was shown to be linear. The limits of detectIon of aminoglycosides in human plasma were between 14.4 and 24.0 nM. Recoveries of spiked aminoglycosides in human plasma were between 92 and 105%.
Chen-wen Whang - One of the best experts on this subject based on the ideXlab platform.
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capillary electrophoresis of baclofen with argon Ion Laser induced fluorescence detectIon
Journal of Chromatography A, 2002Co-Authors: Yisheng Gu, Chen-wen WhangAbstract:Abstract A capillary electrophoretic method with Laser-induced fluorescence detectIon for baclofen (4-amino-3-p-chlorophenylbutyric acid) has been developed. 6-Carboxyfluorescein succinimidyl ester was used for precolumn derivatizatIon of the non-fluorescent drug. Optimal separatIon and detectIon were obtained with an electrophoretic buffer of 50 mM sodium borate (pH 9.5) and an air-cooled argon-Ion Laser (excitatIon at 488 nm, emissIon at 520 nm). Linearity (r≥0.99) over three orders of magnitude was generally obtained and the lowest derivatizable concentratIon limit for baclofen in aqueous solutIon was 10 nM (2 ng baclofen/ml). Coupled with a simple clean up procedure, the method can be applied to the analysis of baclofen in human plasma at micromolar level. Recovery of spiked baclofen in plasma was 95%. The relative standard deviatIon values on peak size (0.5 μM level) and migratIon time were 8.2 and 1.0% (n=7), respectively. The limit of detectIon of baclofen in plasma was 0.1 μM (21 ng/ml).
Marshall R Wilson - One of the best experts on this subject based on the ideXlab platform.
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high intensity argon Ion Laser jet photochemistry reactIons between transient species the additIon of diphenylcarbene to the photoenol of 2 methylbenzophenone
Journal of the American Chemical Society, 1992Co-Authors: Marshall R Wilson, Karlyn A Schnapp, Wesley S PattersonAbstract:In an effort to determine wether the recently developed technique of argon Ion Laser-jet irradiatIon can be effectively applied to this problem of transient-transient reactIons, we have examined the reactIon of diphenylcarbene with a photoenol.
