ChemInform Abstract: THERMAL DECAY OF THE COLORED FORM IN PHOTOCHROMISM OF 2-HYDROXY-4-METHOXYTRIPHENYLMETHANOL IN N-HEXANE

1974 ◽  
Vol 5 (48) ◽  
pp. no-no
Author(s):  
SANYO HAMAI ◽  
HIROSHI KOKUBUN
Keyword(s):  
Colored Form ◽  
Thermal Decay

Photochromism of spiroindolinonaphthoxazine. I. Photophysical properties

1983 ◽  
Vol 61 (2) ◽  
pp. 300-305 ◽  
Author(s):  
Nori Y. C. Chu
Keyword(s):  
Decay Rate ◽  
Photophysical Properties ◽  
Ultraviolet Region ◽  
Colored Form ◽  
Thermal Decay ◽  
Triplet Energy ◽  
Absorption Bands ◽  
Different Temperatures ◽  
Transfer Method ◽  
Triplet Energy Transfer

A solution of spiroindolinonaphthoxazine in a common organic solvent shows profound photochromic effect. The colorless form in ethanol displays three absorption bands (~320, 235, 203 nm) in the ultraviolet region of the spectrum. The absorption spectrum of the colored metastable form shows two prominent absorption peaks at 612 and 578 nm. The triplet state energy level of the colorless form is estimated to be in the range from 2.4 × 104 to 2.1 × 104 cm−1 by the triplet–triplet energy transfer method. There exists a thermal equilibrium between the colorless and colored forms. From the measurement of absorbance of the colored form at different temperatures, the standard enthalpy of equilibrium is obtained (ΔH0 = 1500 cm−1). The thermal decay of the colored form to the colorless form depends strongly on temperature. The decay rate increases three times for every 10 °C increase in temperature. From these temperature dependence studies of the thermal decay rate, the thermal energy barrier for the colored metastable state to decay to the colorless form is determined to be 6.9 × 103 cm−1.

Noise Characteristics and Thermal Decay in Single-layer Perpendicular Recording Media

1998 ◽  
Vol 22 (S_3_PMRS_98) ◽  
pp. S3_5-8
Author(s):  
Y. Hirayama ◽  
Y. Honda ◽  
K. Ito ◽  
T. Takeuchi ◽  
M. Futamoto
Keyword(s):  
Single Layer ◽  
Recording Media ◽  
Thermal Decay ◽  
Perpendicular Recording ◽  
Noise Characteristics

Thermal decay of fiber Bragg gratings written in boron and germanium codoped silica fiber

1997 ◽  
Vol 15 (8) ◽  
pp. 1470-1477 ◽  
Author(s):  
S.R. Baker ◽  
H.N. Rourke ◽  
V. Baker ◽  
D. Goodchild
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Silica Fiber ◽  
Thermal Decay

Electron spin resonance studies of radiation damage. Part III. Gamma irradiated acetonitrile

1970 ◽  
Vol 48 (11) ◽  
pp. 1780-1781 ◽  
Author(s):  
F. P. Sargent
Keyword(s):  
Electron Spin Resonance ◽  
Radiation Damage ◽  
Electron Spin ◽  
Thermal Decay ◽  
Spin Resonance ◽  
Gamma Irradiated

The effects of photobleaching and thermal decay at 77 and 87 °K on the electron spin resonance spectra of gamma irradiated acetonitrile are reported.

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