A 193 nm laser photofragmentation time-of-flight mass spectrometric study of CS2 and CS2 clusters

Article abstract of DOI:10.1063/1.454144

A crossed laser and moleucular beam photofragmentation apparatus is described.The apparatus is equipped with a rotatable molecular beam source and a translationally movable ultrahigh vacuum mass spectrometer for time-of-flight (TOF) measurements.Using this apparatus we have measured the TOF spectra of S and CS resulting from the photofragmentation processes, CS2 + hν(193 nm) -> CS(X,v) + S(¹D or ³P).The translational energy distributions of photofragments derived from the S and CS TOF spectra are in good agreement.This observation, together with the finding that the TOF spectra of S and CS are independent of laser power in the 25-150 mJ range, shows that the further absorption of a laser photon by CS to form C(³P) + S(³P) within the laser pulse is insignificant.The TOF spectra of S obtained at electron ionization energies of 20 and 50 eV are indiscernible, indicating that the contribution to the TOF spectrum of S from dissociative ionization of CS is negligible at electron impact energies <*> 50 eV.The thermodynamical thresholds for the S(¹D) and S(³P) channels are determined to be 18.7 and 45.0 +/- 0.4 kcal/mol, respectively, consistent with literature values.Structures found in the translational energy distribution can be correlated with vibrational structures of CS(X,v = 0-5) associated with the S(¹D) channel.The translational energy distribution supports the previous observation that the vibrational state distribution of CS(X,v) is peaked at v = 3.The TOF experiment is also consistent with the S(³P)/S(¹D) ratio of 2.8 +/- 0.3 determined in a recent vacuum ultraviolet laser induced fluorescence measurement on the S photofragment.Photofragments from CS2 clusters are observed at small laboratory angles with respect to the CS2 beam direction and are found to have velocity distributions peaked at the CS2 cluster beam velocity.

Full text of DOI:10.1063/1.454144

A 193 nm laser photofragmentation timeofflight mass spectrometric study of CS2
and CS2 clusters
W.B. Tzeng, H.M. Yin, W.Y. Leung, J.Y. Luo, S. Nourbakhsh, G. D. Flesch, and C. Y. Ng
Citation: The Journal of Chemical Physics 88, 1658 (1988); doi: 10.1063/1.454144
View online: http://dx.doi.org/10.1063/1.454144
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/88/3?ver=pdfcov
Published by the AIP Publishing
Articles you may be interested in
A laser photofragmentation time-of-flight mass spectrometric study of acetophenone at 193 and 248 nm
J. Chem. Phys. 107, 7230 (1997); 10.1063/1.474964
A 193-nm-laser photofragmentation time-of-flight mass spectrometric study of dimethylsulfoxide
J. Chem. Phys. 106, 86 (1997); 10.1063/1.473025
Statespecific neutral timeofflight of CO from ketene photodissociation at 351 nm: The internal energy
distribution of CH2(X̃ 3 B 1)
J. Chem. Phys. 105, 4550 (1996); 10.1063/1.472538
193 nm laser photofragmentation timeofflight mass spectrometric study of HSCH2CH2SH
J. Chem. Phys. 104, 130 (1996); 10.1063/1.470883
A 193 nm laser photofragmentation timeofflight mass spectrometric study of CH3SSCH3, SSCH3, and SCH3
J. Chem. Phys. 92, 6587 (1990); 10.1063/1.458295
This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.100.75.156 On: Tue, 25 Nov 2014 09:57:57

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
41.100.75.156 On: Tue, 25 Nov 2014 09:57:57
1