Browsing by Author "Jin, Bing"

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Does Ozone-Water Complex Produce Additional OH Radicals in the Atmosphere?
(2012-12-13)
Jin, Bing
;
Su, Man-Nung
;
Lin, Jim Jr-Min
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應用化學系
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Department of Applied Chemistry
Ozone-water complex has been thought to play a role in producing atmospheric OH radicals through its photolysis. Here, we re-examined the absorption cross-section of the ozone-water complex with a new method to tell whether the above speculation is valid. With argon solvation and photoionization by tunable vacuum ultraviolet light, we were able to selectively probe the ozone-water 1:1 complex. The measured cross-section of the complex is only similar to the sum of the cross-sections of ozone and water monomers at 157.6, 248.4, and 308.4 nm. In addition, we did not observe any absorption of the complex at 351.8 nm. The results indicate that the OH production through the photolysis of the ozone-water complex is much slower than previously thought.
Dynamics of the O-18(D-1)+(CO)-O-16 reaction by crossed beam methods and implications for non-mass-dependent oxygen isotope effects in bulk photochemistry experiments
(2014-08-10)
Estillore, Armando D.
;
Jin, Bing
;
Huang, Chia-Pin
;
Garofalo, Lauren
;
Smith, Mica
Photodissociation cross sections of ClOOCl at 248.4 and 266 nm
(2009-11-07)
Lien, Chien-Yu
;
Lin, Wei-Yen
;
Chen, Hsueh-Ying
;
Huang, Wen-Tsung
;
Jin, Bing
This study utilized a mass-resolved detection of ClOOCl to determine its photodissociation cross section, which is the product of the absorption cross section and dissociation quantum yield. An effusive molecular beam of ClOOCl was generated and its photodissociation probability was determined through measuring the decrease in the ClOOCl beam intensity upon laser irradiation. By comparing with a reference molecule, the absolute cross sections of ClOOCl were obtained without knowing its absolute concentration. The determined cross section of ClOOCl at 248.4 nm is (8.85 +/- 0.42)x10(-18) cm(2) at 200 K, significantly larger than previously reported values. The temperature dependence of the cross section was investigated at 248.4 nm in the range of 160-260 K; only a very small and negative temperature effect was observed. Because 248.4 nm is very close to the peak of the UV absorption band of ClOOCl, this work provides a new calibration point for normalizing relative absorption spectra of ClOOCl. In this work, the photodissociation cross section at 266 nm and 200 K was also reported to be (4.13 +/- 0.21)x10(-18) cm(2).