-
4
-
-
0033192075
-
-
N. Katz, I. Furman, O. Biham, V. Pironello, G. Vidali, Astrophys. J. 522, 305 (1999).
-
(1999)
Astrophys. J.
, vol.522
, pp. 305
-
-
Katz, N.1
Furman, I.2
Biham, O.3
Pironello, V.4
Vidali, G.5
-
5
-
-
0035916506
-
-
G. Manico, G. Raguni, V. Pironello, J. Roser, G. Vidali, Astrophys. J. 548, L253 (2001).
-
(2001)
Astrophys. J.
, vol.548
-
-
Manico, G.1
Raguni, G.2
Pironello, V.3
Roser, J.4
Vidali, G.5
-
11
-
-
0347905992
-
-
note
-
2O deposition conditions are typically ∼45° HWHM angular spread and 0.3 to 3 ML/s dose rates.
-
-
-
-
12
-
-
0033525818
-
-
K. P. Stevenson, G. A. Kimmel, Z. Dohnalek, R. S. Smith, B. D. Kay, Science 283, 1505 (1999).
-
(1999)
Science
, vol.283
, pp. 1505
-
-
Stevenson, K.P.1
Kimmel, G.A.2
Dohnalek, Z.3
Smith, R.S.4
Kay, B.D.5
-
13
-
-
0346014594
-
-
note
-
2-1-, beam dissociation probabilities of ∼65%, and Maxwell-Boltzmann kinetic energy distributions of T = 300 K. The H and D beams are incident upon the ASW surface at 0° and 4° relative to the surface normal and are overlapped at the center of the ASW surface with beam diameters of 1.5 mm and 3.5 mm, respectively.
-
-
-
-
14
-
-
0346014596
-
-
note
-
2 from the front of the ASW surface with a differentially pumped quadrupole mass spectrometer (QM5) with an aperture close to the ASW surface to limit the field of view in the TPD. LITD measurements were performed by inducing a temperature jump of typically 20 ns on the surface using a 200 μJ laser pulse at 532 nm focused to a 1.5 mm diameter spot at the center of the overlapped atom beams. The kinetic energy distribution of molecules desorbing during the temperature jump are obtained from the TOF distributions to another differentially pumped mass spectrometer placed 10 cm from the surface (21).
-
-
-
-
15
-
-
24844479448
-
-
in preparation
-
L. Hornekær, A. Baurichter, V. Petrunin, B. Kay, A. Luntz, in preparation.
-
-
-
Hornekær, L.1
Baurichter, A.2
Petrunin, V.3
Kay, B.4
Luntz, A.5
-
16
-
-
0346014593
-
-
note
-
The desorption yield and TPD spectra for HD were unaffected by repeated cycling of H+D adsorption experiments on the same ASW film, indicating that little restructuring of the ASW pore structure takes place as a result of the release of the recombination energy. Hence, the retainment of HD molecules in ASW pores is not caused by pore collapse and volcano formation, as seen for more tightly bound adsorbates exhibiting rapid low-temperature thermal diffusion (25), but is simply due to the fact that particles describing from pore surfaces in the porous network have to undergo a series of adsorption-desorption cycles before making their way to the external film surface, from which desorption into the gas phase can take place.
-
-
-
-
17
-
-
0346645785
-
-
note
-
The distinction between the Langmuir-Hinshelwood (LH) and hot atom reaction mechanisms is in the origin of atom mobility on the 10 K surface. In the LH mechanism, this is caused by thermal atom diffusion, whereas in the hot atom mechanism this is caused by transient mobility on the surface during the adsorption process, i.e., before the atom fully thermalizes on the surface. All experiments reported here are consistent with both mechanisms. Our bias is that the LH mechanism dominates because of the absence of H coverage dependence in apparent rates of recombination and because it is hard to rationalize HD retention in the internal porous surface if hot atom reaction occurs on the external surface.
-
-
-
-
18
-
-
0346014592
-
-
note
-
The small residual signal in Fig. 2 is thought to arise from recombination of atoms trapped at the Cusubstrate-ASW interface.
-
-
-
-
19
-
-
0346014591
-
-
note
-
s ∼ 8 K, as obtained by the King and Wells method.
-
-
-
-
20
-
-
0000305993
-
-
S. Andersson, L. Wilzen, M. Persson, J. Harris, Phys. Rev. B 40, 8146 (1989).
-
(1989)
Phys. Rev. B
, vol.40
, pp. 8146
-
-
Andersson, S.1
Wilzen, L.2
Persson, M.3
Harris, J.4
-
21
-
-
0035881006
-
-
L. Diekhöner, H. Mortensen, A. Baurichter, A. C. Luntz, J. Chem. Phys. 115, 3356 (2001).
-
(2001)
J. Chem. Phys.
, vol.115
, pp. 3356
-
-
Diekhöner, L.1
Mortensen, H.2
Baurichter, A.3
Luntz, A.C.4
-
23
-
-
0001486497
-
-
M. Bonn, M. J. P. Brugmans, A. W. Kleyn, R. A. van Santen, Chem. Phys. Lett. 233, 309 (1995).
-
(1995)
Chem. Phys. Lett.
, vol.233
, pp. 309
-
-
Bonn, M.1
Brugmans, M.J.P.2
Kleyn, A.W.3
Van Santen, R.A.4
-
25
-
-
0038826643
-
-
M. P. Collings, J. W. Dever, H. J. Fraser, M. R. S. McCoustra, D. A. Williams, Astrophys. J. 583, 1058 (2003).
-
(2003)
Astrophys. J.
, vol.583
, pp. 1058
-
-
Collings, M.P.1
Dever, J.W.2
Fraser, H.J.3
McCoustra, M.R.S.4
Williams, D.A.5
-
26
-
-
0346645783
-
-
note
-
Supported by The Danish National Research Council (grant no. 21000269), the Danish National Research Foundation through the Aarhus Center of Atomic Physics, and the Carlsberg Foundation. We thank B. Kay and A. Andersen for useful discussions and advice.
-
-
-
|