Determination of absolute product branching ratios in mass spectrometric experiments: Detecting acetyl radicals at CH2CO+

Journal of Physical Chemistry

Volumn 100, Issue 13, 1996, Pages 5200-5204

  Kitchen, D C ^a   Myers, T L ^a   Butler, L J ^a  

^a UNIVERSITY OF CHICAGO   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0004555450     PISSN: 00223654     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp9536918     Document Type: Article

References (20)

1. 1/2) - 18 from the following: Center, R. E.; Mandl, A. J. Chem. Phys. 1972, 57, 4104.
2. The atomic polarizabilities (α) used are 0.666 793 (H), 1.76 (C), 0.802 (O), and 2.18 (Cl) from the following: Miller, T. M.; Bederson, B. Adv. At. Mol. Phys. 1977, 13, 1.
3. Person, M. D.; Kash, P. W.; Butler, L. J. J. Chem. Phys. 1992, 97, 355.
4. Hop, C. E. C. A.; Holmes, J. L. Int. J. Mass Spectrom. Ion Processes 1991, 104, 213.
5. 2 fragmentation pattern used (Davis, H. F.; Kim, B.; Johnston, H. S.; Lee, Y. T. J. Phys. Chem. 1993, 97, 2172)
6. 2 product is produced vibrationally hot in the following: Butler, L. J.; Krajnovich, D.; Lee, Y. T.; Ondrey, G.; Bersohn, R. J. Chem. Phys. 1983, 79, 1708.
7. Minton, T. K.; Nelson, C. M.; Moore, T. A.; Okumura, M. Science 1992, 258, 1342.
8. Lee, Y. T.; McDonald, J. D.; LeBreton, P. R.; Herschbach, D. R. Rev. Sci. Instrum. 1969, 40, 1402.
9. Person, M. D.; Kash, P. W.; Butler, L. J. J. Chem. Phys. 1991, 96, 2021.
10. North, S. W.; Blank, D. A.; Lee, Y. T. Chem. Phys. Lett. 1994, 224, 38.
11. 37Cl, the effective mass used for the momentum matched panner in our fitting was actually 35.45 amu.
12. North, S. W. Private communication.
13. The Daly detector has near quantum efficiency over a wide range of ion masses; see ref 5.
14. Our forward convolution programs for the c.m. to laboratory frame transformations were adapted from the CMLAB programs written by the Y. T. Lee group.
15. Waschewsky, G. C. G.; Kash, P. W.; Myers, T. L.; Kitchen, D. C.; Butler, L. J. J. Chem. Soc., Faraday Trans. 1994, 90, 1581.
16. Extrel quadrupole manual; Extranuclear Laboratories, Inc., Pittsburgh, PA, 1979.
17. Deshmukh, S.; Myers, J. D.; Xantheas, S. S.; Hess, W. P. J. Phys. Chem. 1994, 98, 12535.
18. The chloroacetone conformer which we refer to here as "trans" should, in correct nomenclature, be called s-cis, as the dihedral angle between the C-Cl and the C=O bonds is zero and the Cl and O atoms, having the highest atomic numbers, should determine the groups to which the geometry refers. We retain the nonstandard name trans, however, to remain consistent with several earlier studies.
19. The nozzle temperature is measured during experiments by a chromel-alumel thermocouple which is held near the nozzle tip with only tension. This results in temperature readings which vary with thermocouple position and degree of contact.
20. Yamashita, S. Bull. Chem. Soc. Jpn. 1976, 49, 188.