Lenses

Beck, Conrad

doi:10.1088/0950-7671/6/2/302

Cited by 2 publications

(2 citation statements)

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“…A Lambda Physik N,-laser MlOOA (337 nm, 1 MW, 3.5nsec FWHM) or a N,-laser pumped dye laser (0.1 -0.2 MW) was used as the excitation light source. For the analysing light we pulsed a Xenon arc lamp (450 W) to increase the light intensity [4]. Both light beams were made collinear by a (dichromatic) beam splitter and were focused on a pinhole (1 mm diameter) before entering the sample cell (quartz, 10 mm light path).…”

Section: Experimental 21 Laser Flash Photolysismentioning

confidence: 99%

The triplet state in trans → cis‐photoisomerization of thioindigo

Karstens

Kobs

Memming

1979

Ber Bunsenges Phys Chem

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The triplet state processes in thioindigo have been investigated with respect to the mechanism of the trans → cis photoisomerization by laser flash photolysis. According to our experimental results the intersystem crossing takes place from the trans singlet to the trans triplet. This is also the only transient, which is detected spectroscopically. An activation energy barrier between the trans‐ and a twisted triplet determines the internal rotation. The twisted triplet decays nonradiatively to the cis and trans groundstates. A model for the mechanism of the trans → cis photoisomerization is proposed. — Preliminary results for the cis → trans photoisomerization indicate an internal rotation in the excited singlet state to a transoid configuration followed by intersystem crossing to the trans triplet from which the molecule decays into the ground state.

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Section: Experimental 21 Laser Flash Photolysismentioning

confidence: 99%

The triplet state in trans → cis‐photoisomerization of thioindigo

Karstens

Kobs

Memming

1979

Ber Bunsenges Phys Chem

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“…Fairfield N.J. 07006, U.S.A.). These have been described by Beck (1976) and Witonsky (1977). The integrator would appear to provide a n alternative means of meeting these criteria, in that the 'temperatureltime' kinetics of the ideal indicator could easily be incorporated into the instruments program.…”

Section: Thermal Death Curvesmentioning

confidence: 76%

Evaluation of a prototype micro-electronic autoclave cycle integrator

Kirk

Hambleton

1981

Journal of Pharmacy and Pharmacology

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Instability and non‐uniformity of spore preparations and the non‐conformity of chemical indicators to the temperature coefficients of spore inactivation are problems associated with current methods of autoclave cycle monitoring. A prototype micro‐electronic instrument, which largely overcomes these problems, is described. It monitors autoclave cycles in terms of the integral F0 and Nabla functions. Its thermometric and integrating accuracy is demonstrated. A discussion of the problems associated with the use of sensitive electronic instruments in the autoclave room environment reveals the need for independent monitoring areas when such devices are used. Inactivation constants were determined for spores of the organism Bacillus stearothermophilus, NCTC 10 003 and were described using D115 (12.0 min) and Z (9.0 °C) values and the first order reaction Arrhenius constants A (1041, 2 min−1) and Ea (74.4 kcal mol−1, 311 kJ mol−1). These have been compared with recently published values. The standardization of F0 and Nabla is discussed with reference to the setting of minimum values related to product bioburden and maximum values related to an acceptable degree of product degradation.

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Lenses

Cited by 2 publications

References 0 publications

The triplet state in trans → cis‐photoisomerization of thioindigo

The triplet state in trans → cis‐photoisomerization of thioindigo

Evaluation of a prototype micro-electronic autoclave cycle integrator

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