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Your search keyword '"Ng, C.Y."' showing total 6 results
Start Over Author "Ng, C.Y." Publisher american chemical society
6 results on '"Ng, C.Y."'

1. The heat of formation of 2-C3H7+ and proton affinity of C3H6 determined by pulsed field ionization-photoelectron photoion coincidence spectroscopy

Author

Baet, Thomas, Song, Y., Ng, C.Y., Liu, Jianbo, and Chen, Wenwu

Subjects
Chemistry, Physical and theoretical -- Models, Chemicals, plastics and rubber industries
Abstract

A new value for the proton affinity of C3H6 is offered. The calculation was obtained by pulsed field ionization-photoelectron photoion coincidence spectroscopy.

Published
2000

2. A Gaussian-2 study of isomeric C2H2N and C(sub 2)H(sub 2)N(super +)

Author

Lau, Kai-Chung, Li, Wai-Kee, Ng, C.Y., and Chiu, S.-W.

Subjects
Carbon compounds -- Research, Complex compounds -- Research, Radicals (Chemistry) -- Research, Chemicals, plastics and rubber industries
Abstract

A new Gaussian-2 method incorporating the energy correction due to spin contamination has been used in studying the structures and energetics of C2H2N and C(sub 2)H(sub 2)N(super +) isomers. The heat of reaction(sub f298) obtained with the new technique shows good agreement with existing data. However, the results for CH2NC and CH(sub 2)NC(super +) as well as for c-NCHCH and c-NCHCH+ do not agree with available experimental data. CH2NC may be the product of the reaction between the nitrogen atom and the vinyl radical based on the ionization energies of the C2H2N isomers.

Published
1999

3. Combining theory with experiment: assessment of the thermochemistry of SF(sub n), SF(sub n)(super +), and SF(sub n)(super -), n = 1 - 6

Author

Cheung, Y. -S, Chen, Y.-J., Ng, C.Y., Chiu, See-Wing, and Li, Wai-Kea

Subjects
Chemical reactions -- Analysis, Sulfur compounds -- Research, Chemistry
Abstract

The Gaussian-2, G2 and G2(MP2) ab initio quantum chemical calculations are suitable for obtaining energy values with 4-5 kcal/mol accuracy for complex sulphur-containing molecular moieties. The stabilities of closed shell molecular species is responsible for the irregular values obtained for various bond dissociation energies. The experimental technique of the calculation is discussed.

Published
1995

5. Study of the dissociation of CH3SCH3(super +1) by collisional activation: evidence of nonstatistical behavior

Author

Chen, Y.-J., Li, Wai-Kee, Fenn, P.T., Lau, Kai-Chung, Ng, C.Y., and Law, Chi-Kin

Subjects
Energy transfer -- Research, Dissociation -- Research, Chemical bonds -- Research, Chemistry, Physical and theoretical -- Research, Chemicals, plastics and rubber industries
Abstract

The collision-induced dissociation (CID) reaction of CH3SCH3(super +) is investigated in a triple-quadrupole, double-ocotpole ion-molecule reaction mechanism. The high generation of CH3S(super +) + CH3 is due to the characteristic translational-to-vibrational energy transfer for the C - S stretching modes with lower frequencies.

Published
2002

6. High resolution pulsed field ionization-photoelectron bands for CS2(super +1)(A~(super 2)pi(sub u)): an experimental and theoretical study

Author

Liu, Jianbo, Hochlaf, M., Rosmus, P., Chambaud, G., and Ng, C.Y.

Subjects
Ionization -- Research, Photoelectrons -- Research, Ablation (Vaporization technology) -- Research, Chemicals, plastics and rubber industries
Abstract

The vacuum ultraviolet pulsed field ionization-photoelectron (PFI-PE) spectra for CS2 are measured in full energy range of 12.6-13.5 eV, revealing complex vibronic band structures for the CS2(super +)[A~(super 2)pi(sub u)] state. Three dimensional potential energy functions for CS2 (super +1)[A~(super 2)pi(sub u)] are also generated theoretically.

Published
2001

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