Collisional stabilization of highly vibrationally excited o-, m- and p-xylene ions (C8H10+) from 300-900 K and 1-250 Torr

Abel I. Fernandez; I. Dotan; Thomas M. Miller; J. Troe; Jeffrey F. Friedman; A. Viggiano

doi:10.1016/j.ijms.2005.11.020

Collisional stabilization of highly vibrationally excited o-, m- and p-xylene ions (C₈H₁₀⁺) from 300-900 K and 1-250 Torr

Abel I. Fernandez, I. Dotan, Thomas M. Miller, J. Troe, Jeffrey F. Friedman, A. Viggiano

Chemistry discipline

Research output: Contribution to journal › Article › peer-review

Abstract

Branching ratios for the reactions of O₂⁺ with all three xylene isomers have been measured as a function of temperature over a wide range (300-900 K) at a fixed number density (1.45 × 10¹⁶ molecule cm^-3 of helium) and for m-xylene over an extended buffer gas pressure (50-250 Torr of nitrogen) and temperature (473-623 K) range. Rate constants measured under selected conditions indicate that the reactions proceed at the collisional rate. Two main products were observed in each reaction: the stabilized parent ion, C₈H₁₀⁺ (S) and a dissociative charge transfer product, C₇H₇⁺ (D). The ratio of S/D was found to vary significantly with both temperature and pressure. At high pressure very little dissociation occurred. Results of statistical modeling similar to that used in our studies of n-alkylbenzenes represent the data well.

Original language	English
Pages (from-to)	379-384
Number of pages	6
Journal	International Journal of Mass Spectrometry
Volume	249-250
DOIs	https://doi.org/10.1016/j.ijms.2005.11.020
State	Published - 1 Mar 2006

Bibliographical note

Funding Information:
This work has been supported by funding through the Deutsche Forschungsgemeinschaft (SFB 357 “Molekulare Mechanismen unimolekularer Prozesse”), the European Office for Aerospace Research (EOARD Grant No. FA 8655-03-1-3034) and the United States Air Force Office of Scientific Research (Project 2303 EP4). T.M.M. is under contract (FA8718-04-C0006) to the Institute for Scientific Research of Boston College.

Keywords

Collisional stabilization
Pressure dependence
Temperature dependence
Unimolecular dissociation
Xylene

Access to Document

10.1016/j.ijms.2005.11.020

Cite this

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title = "Collisional stabilization of highly vibrationally excited o-, m- and p-xylene ions (C8H10+) from 300-900 K and 1-250 Torr",

abstract = "Branching ratios for the reactions of O2+ with all three xylene isomers have been measured as a function of temperature over a wide range (300-900 K) at a fixed number density (1.45 × 1016 molecule cm-3 of helium) and for m-xylene over an extended buffer gas pressure (50-250 Torr of nitrogen) and temperature (473-623 K) range. Rate constants measured under selected conditions indicate that the reactions proceed at the collisional rate. Two main products were observed in each reaction: the stabilized parent ion, C8H10+ (S) and a dissociative charge transfer product, C7H7+ (D). The ratio of S/D was found to vary significantly with both temperature and pressure. At high pressure very little dissociation occurred. Results of statistical modeling similar to that used in our studies of n-alkylbenzenes represent the data well.",

keywords = "Collisional stabilization, Pressure dependence, Temperature dependence, Unimolecular dissociation, Xylene",

author = "Fernandez, {Abel I.} and I. Dotan and Miller, {Thomas M.} and J. Troe and Friedman, {Jeffrey F.} and A. Viggiano",

note = "Funding Information: This work has been supported by funding through the Deutsche Forschungsgemeinschaft (SFB 357 “Molekulare Mechanismen unimolekularer Prozesse”), the European Office for Aerospace Research (EOARD Grant No. FA 8655-03-1-3034) and the United States Air Force Office of Scientific Research (Project 2303 EP4). T.M.M. is under contract (FA8718-04-C0006) to the Institute for Scientific Research of Boston College.",

year = "2006",

month = mar,

day = "1",

doi = "10.1016/j.ijms.2005.11.020",

language = "אנגלית",

volume = "249-250",

pages = "379--384",

journal = "International Journal of Mass Spectrometry",

issn = "1387-3806",

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TY - JOUR

T1 - Collisional stabilization of highly vibrationally excited o-, m- and p-xylene ions (C8H10+) from 300-900 K and 1-250 Torr

AU - Fernandez, Abel I.

AU - Dotan, I.

AU - Miller, Thomas M.

AU - Troe, J.

AU - Friedman, Jeffrey F.

AU - Viggiano, A.

N1 - Funding Information: This work has been supported by funding through the Deutsche Forschungsgemeinschaft (SFB 357 “Molekulare Mechanismen unimolekularer Prozesse”), the European Office for Aerospace Research (EOARD Grant No. FA 8655-03-1-3034) and the United States Air Force Office of Scientific Research (Project 2303 EP4). T.M.M. is under contract (FA8718-04-C0006) to the Institute for Scientific Research of Boston College.

PY - 2006/3/1

Y1 - 2006/3/1

N2 - Branching ratios for the reactions of O2+ with all three xylene isomers have been measured as a function of temperature over a wide range (300-900 K) at a fixed number density (1.45 × 1016 molecule cm-3 of helium) and for m-xylene over an extended buffer gas pressure (50-250 Torr of nitrogen) and temperature (473-623 K) range. Rate constants measured under selected conditions indicate that the reactions proceed at the collisional rate. Two main products were observed in each reaction: the stabilized parent ion, C8H10+ (S) and a dissociative charge transfer product, C7H7+ (D). The ratio of S/D was found to vary significantly with both temperature and pressure. At high pressure very little dissociation occurred. Results of statistical modeling similar to that used in our studies of n-alkylbenzenes represent the data well.

AB - Branching ratios for the reactions of O2+ with all three xylene isomers have been measured as a function of temperature over a wide range (300-900 K) at a fixed number density (1.45 × 1016 molecule cm-3 of helium) and for m-xylene over an extended buffer gas pressure (50-250 Torr of nitrogen) and temperature (473-623 K) range. Rate constants measured under selected conditions indicate that the reactions proceed at the collisional rate. Two main products were observed in each reaction: the stabilized parent ion, C8H10+ (S) and a dissociative charge transfer product, C7H7+ (D). The ratio of S/D was found to vary significantly with both temperature and pressure. At high pressure very little dissociation occurred. Results of statistical modeling similar to that used in our studies of n-alkylbenzenes represent the data well.

KW - Collisional stabilization

KW - Pressure dependence

KW - Temperature dependence

KW - Unimolecular dissociation

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