ChemInform Abstract: Multiphoton Ionization of Vinyl Chloride, Trifluoroethylene, and Benzene at 193 nm.

ChemInform ◽  
1987 ◽  
Vol 18 (47) ◽  
Author(s):  
M. J. ROSSI ◽  
H. HELM
Keyword(s):  
Vinyl Chloride ◽  
Multiphoton Ionization ◽  
193 Nm

Product state distribution in the photodissociation of vinyl chloride at 193 nm

1991 ◽  
Vol 178 (5-6) ◽  
pp. 511-516 ◽  
Author(s):  
Peter T.A. Reilly ◽  
Yongjin Xie ◽  
Robert J. Gordon
Keyword(s):  
Vinyl Chloride ◽  
Product State ◽  
State Distribution ◽  
193 Nm

Photodissociation Dynamics of Vinyl Chloride Investigated with a Pulsed Slit-Jet and Time-Resolved Fourier-Transform Spectroscopy

2004 ◽  
Vol 57 (12) ◽  
pp. 1161 ◽  
Author(s):  
Mohammed Bahou ◽  
Yuan-Pern Lee
Keyword(s):  
Fourier Transform ◽  
Vinyl Chloride ◽  
Flow System ◽  
Supersonic Jet ◽  
Infrared Emission ◽  
Time Resolved ◽  
Type Distribution ◽  
Trajectory Calculations ◽  
Rotational Distribution ◽  
193 Nm

Following photodissociation of vinyl chloride seeded in a He supersonic jet at 193 nm, rotationally resolved infrared emission of HCl (v) are recorded to yield nascent rotational and vibrational distributions. Preliminary results show that the rotational distribution of HCl free from rotational quenching deviates slightly from Boltzmann-type distribution and agrees well with trajectory calculations; a portion of the low-J component observed previously in a flow system is attributed to quenching. The implications for photodissociation dynamics are discussed.

Trace Detection of Nitrocompounds by ArF Laser Photofragmentation/Ionization Spectrometry

1993 ◽  
Vol 47 (11) ◽  
pp. 1907-1912 ◽  
Author(s):  
Josef B. Simeonsson ◽  
George W. Lemire ◽  
Rosario C. Sausa
Keyword(s):  
Ground State ◽  
Multiphoton Ionization ◽  
Ionization Mass ◽  
Trace Detection ◽  
Atmospheric Conditions ◽  
Experimental Conditions ◽  
Detection Range ◽  
Arf Laser ◽  
Free Environment ◽  
193 Nm

A new method for detecting trace vapors of NO2-containing compounds near atmospheric conditions has been demonstrated with the use of one-color-laser photofragmentation/ionization spectrometry. An ArF laser is employed to both photolytically fragment the target molecules in a collision-free environment and ionize the characteristic NO fragments. The production of NO is hypothesized to result from a combination of two NO2 unimolecular fragmentation pathways, one yielding NO in its X2II electronic ground state and the other in its A2Σ+ excited state. Ionization of ground-state NO molecules is accomplished by resonance-enhanced multiphoton ionization processes via its A2Σ+ ← X2II (3, 0), B2II ← X2II (7, 0) and/or D2Σ+ ← X2II (0, 1) bands at 193 nm. The analytical utility of this method is demonstrated in a molecular beam time-of-flight apparatus. Limits of detection range from the parts-per-million (ppm) to parts-per-billion (ppb) level for NO, NO2, CH3NO2, dimethylnitramine (DMNA), ortho- and meta-nitrotoluene, nitrobenzene, and trinitrotoluene (TNT). Under effusive beam experimental conditions, discrimination between structural isomers, ortho-nitrotoluene and meta-nitrotoluene, has been demonstrated with the use of their characteristic photofragmentation/ionization mass spectra.

Further investigation of the HCl elimination in the photodissociation of vinyl chloride at 193 nm: a direct MP2/6-31G(d,p) trajectory study

2004 ◽  
Vol 386 (4-6) ◽  
pp. 225-232 ◽  
Author(s):  
E Martı́nez-Núñez ◽  
S.A Vázquez ◽  
F.J Aoiz ◽  
L Bañares ◽  
J.F Castillo
Keyword(s):  
Vinyl Chloride ◽  
193 Nm

scholarly journals HCL(B1∑+) and HBr(B1∑+) Emission From the Ultraviolet Multiphoton Dissociation of Vinyl Chloride and Bromide

1996 ◽  
Vol 16 (4) ◽  
pp. 207-218 ◽  
Author(s):  
Mohamed Oujja ◽  
Javier Ruiz ◽  
Rebeca De Nalda ◽  
Marta Castillejo
Keyword(s):  
Excited State ◽  
Vinyl Chloride ◽  
Ground State ◽  
Narrow Band ◽  
Tunable Laser ◽  
Resonant Absorption ◽  
Hydrogen Halide ◽  
Uv Emission ◽  
Multiphoton Dissociation ◽  
193 Nm

Multiphoton dissociation processes of vinyl chloride and bromide were studied with a broadband ArF laser at 193 nm and with a narrowband tunable laser in the region of 212 nm, in the peak and in the threshold of the absorption band, respectively, for both compounds. Photolysis at 193 nm gives rise to the corresponding hydrogen halide in the B1∑+ excited state which results in an intense UV emission. However these emissions are absent when photodissociation was performed with the narrow band dye laser around 212 nm. These results, together with a calculation of the observed spectra, give further support to a mechanism which invokes one-photon resonant absorption of vibrationally hot ground state hydrogen halide as the process which populates the excited B1∑+ state of the fragment.

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