Dimers in Supersonic Molecular Beams

Dittmers, H. J.; Schütze, C.; Fischer, Bilha; Schügerl, K.

doi:10.1524/zpch.1972.80.3_6.220

Cited by 11 publications

(2 citation statements)

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“…Since only b¡jk contributes to Ds, while D is modified by biJk + 7$, the integral over is given by the difference between the final terms on the right-hand side of eq 5.3. ] Theoretical results related to ours have been obtained by van Megen et al 5 and by Snook et al22 van Megen et al used equations like (3.14), but performed the averages with a statistical-mechanical Monte Carlo simulation of the hard-sphere fluid. This method automatically uses the true concentration-dependent ffn\ rather than the power series of eq 3.10. van Megen et al obtain numbers for Dm at various 0, not expressions which can be compared with Table I.…”

Section: Discussionsupporting

confidence: 66%

Second-order concentration correction to the mutual diffusion coefficient of a suspension of hard Brownian spheres

Carter¹,

Phillies²

1985

J. Phys. Chem.

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Section: Discussionsupporting

confidence: 66%

Second-order concentration correction to the mutual diffusion coefficient of a suspension of hard Brownian spheres

Carter¹,

Phillies²

1985

J. Phys. Chem.

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“…For the other extreme case q = 1, the terminal dimer mole fraction is dominated by dimer formation during the free-jet expansion and the initial concentration of dimers is negligible. The available data for terminal dimer concentrations in free-jet expansions of rare gases 28,29,71,72 are correlated satisfactorily by q = 0.4 ͑Refs. 33 and 34͒ indicating that both thermodynamics and kinetics play a role.…”

Section: A Dimer Formationmentioning

confidence: 82%

A mass and time-of-flight spectroscopy study of the formation of clusters in free-jet expansions of normal D2

Ekinci

Knuth

Toennies

2006

The Journal of Chemical Physics

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The mass spectra in the range of 2(D+)-38(D19+) amu of clusters formed in a supersonic free-jet expansion of normal D2 are investigated as functions of source temperature in the range of 95-220 K and of source pressure in the range of 10-120 bars. For some of the small ion fragments, time-of-flight distributions are also measured. For large clusters (n > 200) the intensities of the odd-numbered ion fragments exhibit magic numbers at D9+ and D15+ in accordance with previous experiments and calculations. The even-numbered ion fragments have much smaller intensities and exhibit new magic numbers at D10+ and D14+. For source conditions such that large clusters are formed, the intensities of the various different ion fragments are observed to saturate beyond a certain source pressure. At lower source pressures, where only small clusters are formed, the terminal mole fractions of the neutral dimers are analyzed in the light of available theories which take into account both the thermodynamics and the kinetics of the expansion. At higher source pressures and lower temperatures, where larger clusters are formed, the sizes of the neutral clusters are estimated using scaling laws and are found to be consistent with the mass spectra and measured time-of-flight distributions. By using a variety of techniques it has been possible to obtain reliable conclusions about the neutral cluster sizes for the present free-jet expansion conditions.

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