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Fragmentation cross sections of protonated water clusters
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10.1063/1.4722886
/content/aip/journal/jcp/136/21/10.1063/1.4722886
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/21/10.1063/1.4722886
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental relative intensities of fragments (H2O) n H+ (black lines) from the collision of (H2O)30H+ with H2O molecules at four center-of-mass collision energies E cm. Continuous and dashed red lines are obtained from Monte Carlo simulations (continuous line: 3n − 6 degrees of freedom, ν 0 = 5.5 THz, dashed line: 6n − 6 degrees of freedom, ν 0 = 6.5 THz, see text).

Image of FIG. 2.
FIG. 2.

Experimental data points for −ln(I/I 0) (see relation (1)) as a function of the product of water vapor density in the cell times the cell length. The continuous line is a linear fit through the data points. The fit yields a value of 125 Å2 for the fragmentation cross section. The data points are obtained for (H2O)30H+ clusters at a collision energy of 2.3 eV.

Image of FIG. 3.
FIG. 3.

Fragmentation cross section, relative to the geometrical cross section, plotted for various cluster sizes and collision energies. (a) Fragmentation of deuterated heavy water clusters induced by collisions with heavy water molecules. (b) Fragmentation of protonated water clusters induced by collisions with water molecules.

Image of FIG. 4.
FIG. 4.

Cross section of the fragmentation of (H2O)30H+ induced by collisions with H2O molecules as a function of collision energy for two different initial temperatures of the cluster (25 K and 100 K). The continuous and dashed lines are obtained from a Monte Carlo simulation using the model described in the text. Continuous line: 3n − 6 degrees of freedom, ν 0 = 5.5 THz, dashed line: 6n − 6 degrees of freedom, ν 0 = 6.5 THz. The straight line (red online) at 210 Å2 is the geometrical cross section.

Image of FIG. 5.
FIG. 5.

The radial energy transfer: only the energy transferred along the radial component v radial is assumed to be transferred into internal energy.

Image of FIG. 6.
FIG. 6.

Fragmentation cross section, relative to the geometrical cross section, plotted as a function of the duration of the collisions for different cluster sizes for D2O (a) and H2O (b) clusters. The vertical lines indicate the vibrational period deduced here from ν 0 = 5.5 THz.

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/content/aip/journal/jcp/136/21/10.1063/1.4722886
2012-06-01
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fragmentation cross sections of protonated water clusters
http://aip.metastore.ingenta.com/content/aip/journal/jcp/136/21/10.1063/1.4722886
10.1063/1.4722886
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