Size-dependent fragmentation of carbon dioxide clusters

Dąbek, J.; Michalak, Leszek

doi:10.1016/s0042-207x(01)00239-1

Cited by 7 publications

(9 citation statements)

References 18 publications

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“…No enhancement of the signals in these mass channels is observed, indicating that reaction ͑3͒ is the actual mechanism for the appearance of the ͑CO 2 ͒ n−2 O 2 + series of cluster ions. If these results are compared to those for electron impact ionization, 16 as expected, one finds significantly less cluster fragmentation generated by 26.5 eV photoionization.…”

Section: Resultssupporting

confidence: 59%

“…The ions corresponding to ͑CO 2 ͒ n O 2 + daughters may arise from ͑CO 2 ͒ n+1 O + losing one CO molecule. 16 Relative intensity anomalies are also observed at n =4,5 and n = 15, 16 at multiple stagnation pressures. The increased cluster ion intensity at n =4,5 can be attributed to a stable symmetrical structure for the ͑CO 2 ͒ n + ion.…”

Section: Introductionmentioning

confidence: 90%

“…1 Many experiments employing supersonic expansion coupled with mass spectroscopic detection have been conducted in order to study monomeric and clustered CO 2 structure and behavior. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Spectroscopic and photochemical properties of ͑CO 2 ͒ n should be related to cluster structure.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, as in most electron impact cluster studies, fragmentation effects from larger clusters tend to blur the true relative intensities of the neutral cluster size distribution. 16 With this technique, one does not observe the true neutral cluster distribution.…”

Section: Introductionmentioning

confidence: 99%

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Single photon ionization of van der Waals clusters with a soft x-ray laser: (CO2)n and (CO2)n(H2O)m

Heinbuch

Dong

Rocca

et al. 2006

The Journal of Chemical Physics

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Pure neutral ͑CO 2 ͒ n clusters and mixed ͑CO 2 ͒ n ͑H 2 O͒ m clusters are investigated employing time of flight mass spectroscopy and single photon ionization at 26.5 eV. The distribution of pure ͑CO 2 ͒ n clusters decreases roughly exponentially with increasing cluster size. During the ionization process, neutral clusters suffer little fragmentation because almost all excess cluster energy above the vertical ionization energy is taken away by the photoelectron and only a small part of the photon energy is deposited into the ͑CO 2 ͒ n cluster. Metastable dissociation rate constants of ͑CO 2 ͒ n + are measured in the range of ͑0.2-1.5͒ ϫ 10 4 s −1 for cluster sizes of 5 ഛ n ഛ 16. Mixed CO 2 -H 2 O clusters are studied under different generation conditions ͑5% and 20% CO 2 partial pressures and high and low expansion pressures͒. At high CO 2 concentration, predominant signals in the mass spectrum are the ͑CO 2 ͒ n + cluster ions. The unprotonated cluster ion series ͑CO 2 ͒ n H 2 O + and ͑CO 2 ͒ n ͑H 2 O͒ 2 + are also observed under these conditions. At low CO 2 concentration, protonated cluster ions ͑H 2 O͒ n H + are the dominant signals, and the protonated CO 2 ͑H 2 O͒ n H + and unprotonated ͑H 2 O͒ n + and ͑CO 2 ͒ ϫ͑H 2 O͒ n + cluster ion series are also observed. The mechanisms and dynamics of the formation of these neutral and ionic clusters are discussed.

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Single photon ionization of van der Waals clusters with a soft x-ray laser: (CO2)n and (CO2)n(H2O)m

Heinbuch

Dong

Rocca

et al. 2006

The Journal of Chemical Physics

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“…The apparatus used for measurements presented here has been described in detail previously 22,. 23,, 44–46 Neutral clusters are produced by adiabatic expansion through a 40 µm stainless steel nozzle (a round orifice in a wall of 0.15 mm thickness). The expanded beam is collimated by a conical skimmer of 0.4 mm inner entrance diameter at 0.7 cm distance from the nozzle (see Fig.…”

Section: Methodsmentioning

confidence: 99%