University of California, Riverside

Department of Chemistry



Faculty


 

 

Jingsong Zhang
Professor of Chemistry & Chair of Chemistry Dept.

 

University of Science and Technology of China - B.S. (1987)
University of California, Berkeley - Ph.D. (1993)
University of Southern California - Postdoc. Fellow (1993-1996)

Office: 132 Chemical Sciences
Phone O/L: (951) 827-4197/3739
Email: jingsong.zhang@ucr.edu
Research Area: Analytical Chemistry, Environmental Chemistry, Materials Chemistry, Physical Chemistry


Biography


Our research concentrates on elementary processes of transient reactive intermediates, with an emphasis on atmospheric and combustion chemistry. This research aims to provide fundamental and quantitative understanding of free radical chemistry by exploring a broad range of important basic and practical scientific issues.
  • Photodissociation dynamics of small free radicals and molecules: Free radicals play dominant roles in much of chemistry, and yet their photochemical mechanisms and reactivity have not been well characterized. State-resolved photodissociation dynamics of prototypical free radicals provide benchmarks for exploring potential energy surfaces and their influences on chemical dynamics, as well as basic understanding of free radical electronic structures, thermodynamics, and decomposition mechanisms. A high-n Rydberg-atom time-of-flight technique is utilized to study photochemistry of jet-cooled free radicals generated and isolated in a supersonic beam. With a much higher resolution and sensitivity than traditional techniques, rovibrationally state-resolved translational energy and angular distributions of H-atom product channels can be obtained, and multi-dimensional dissociation dynamics of free radicals are revealed in great detail. Photochemical systems of interest include alkyl, alkyl peroxy, and alkoxy radicals, which are key intermediates in tropospheric oxidation.
  • Laser spectroscopic detection and chemical kinetics of atmospheric transient species: in situ detection and kinetic studies of important atmospheric transient species provide fundamental knowledge of atmospheric chemis-try. Cavity ring-down spectroscopy (CRDS), a sensitive multi-pass laser absorption technique that provides long absorption path (~ 1 km) in a compact setup, is utilized as a powerful analytical tool to detect atmospheric transient species. In addition, spectroscopy and kinetics of free radicals (alkyl, alkyl peroxy, alkoxy, etc.) are studied by CRDS and laser-induced fluorescence. These studies aim to address major questions concerning kinetics, mechanisms, and products of atmospheric free radical reactions, thus providing a basis for detailed understanding of more complex problems.
  • Mass spectrometric study of reactive intermediates in technologically important and environmentally related chemical processes: Identification of key reaction intermediates is pivotal to accessing mechanisms of important processes such as combustion. Flash pyrolysis of reaction precursors, coupled with supersonic cooling and laser photoionization/mass spectrometry, is utilized for direct observation and analysis of initial reactive intermediates.

Awards

Selected Publications

 

More Information 

General Campus Information

University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

Department Information

Department of Chemistry
Chemical Sciences
501 Big Springs Road

Tel: (951) 827-3789 (Chair's Assistant)
Fax: (951) 827-2435 (confidential)
E-mail: jingsong.zhang@ucr.edu

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