Comparative studies of O-2 and N-2 in pure, mixed and layered CO ices

Guido W. Fuchs, Kinsuk Acharyya, Suzanne E. Bisschop, Karin I. Oeberg, Fleur A. van Broekhuizen, Helen J. Fraser, Stephan Schlemmer, Ewine F. van Dishoeck, Harold Linnartz

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We present laboratory data on pure, layered and mixed CO and O-2 ices relevant for understanding the absence of gaseous O-2 in space. Experiments have been performed on interstellar ice analogues under ultra high vacuum conditions by molecular deposition at 14 K on a gold surface. A combination of reflection absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD) is used to derive spectroscopic and thermodynamic properties of the ices. It is found that for pure ices the desorption energy of O-2 is larger than that of CO and N-2. TPD spectra reveal similar desorption processes for all examined CO - O-2 ice morphologies. The different amorphous and crystalline components of pure (CO)-C-13 RAIR spectra are analyzed. The RAIRS data of the (CO)-C-13 stretching vibration show a significant difference between layered and mixed CO - O-2 ices: layered CO - O-2 ices resemble that of pure (CO)-C-13 whereas the spectra of mixed ices are broadened. The experiments also show that the sticking probabilities of O-2 on CO and O-2 on O-2 are close to unity. These new results are compared with recently analyzed data of CO - N-2 ices.(1,2) The differences in the TPD and RAIRS spectra of the CO - N-2 and CO - O-2 ice systems are explained by differences in quadrupole intermolecular interactions and by different crystallization processes of these ices.

LanguageEnglish
Pages331-345
Number of pages15
JournalFaraday Discussions
Volume133
DOIs
Publication statusPublished - 2006

Fingerprint

Ice
Carbon Monoxide
ice
desorption
Temperature programmed desorption
Absorption spectroscopy
absorption spectroscopy
Infrared spectroscopy
infrared spectroscopy
Desorption
Ultrahigh vacuum
Crystallization
ultrahigh vacuum
temperature
Gold
unity
Stretching
thermodynamic properties
quadrupoles
Thermodynamic properties

Keywords

  • interstellar clouds
  • spectroscopy
  • thermal desorption
  • molecular clouds
  • grain mantles

Cite this

Fuchs, G. W., Acharyya, K., Bisschop, S. E., Oeberg, K. I., van Broekhuizen, F. A., Fraser, H. J., ... Linnartz, H. (2006). Comparative studies of O-2 and N-2 in pure, mixed and layered CO ices. Faraday Discussions, 133, 331-345. https://doi.org/10.1039/b517262b
Fuchs, Guido W. ; Acharyya, Kinsuk ; Bisschop, Suzanne E. ; Oeberg, Karin I. ; van Broekhuizen, Fleur A. ; Fraser, Helen J. ; Schlemmer, Stephan ; van Dishoeck, Ewine F. ; Linnartz, Harold. / Comparative studies of O-2 and N-2 in pure, mixed and layered CO ices. In: Faraday Discussions. 2006 ; Vol. 133. pp. 331-345.
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Fuchs, GW, Acharyya, K, Bisschop, SE, Oeberg, KI, van Broekhuizen, FA, Fraser, HJ, Schlemmer, S, van Dishoeck, EF & Linnartz, H 2006, 'Comparative studies of O-2 and N-2 in pure, mixed and layered CO ices' Faraday Discussions, vol. 133, pp. 331-345. https://doi.org/10.1039/b517262b

Comparative studies of O-2 and N-2 in pure, mixed and layered CO ices. / Fuchs, Guido W.; Acharyya, Kinsuk; Bisschop, Suzanne E.; Oeberg, Karin I.; van Broekhuizen, Fleur A.; Fraser, Helen J.; Schlemmer, Stephan; van Dishoeck, Ewine F.; Linnartz, Harold.

In: Faraday Discussions, Vol. 133, 2006, p. 331-345.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Comparative studies of O-2 and N-2 in pure, mixed and layered CO ices

AU - Fuchs, Guido W.

AU - Acharyya, Kinsuk

AU - Bisschop, Suzanne E.

AU - Oeberg, Karin I.

AU - van Broekhuizen, Fleur A.

AU - Fraser, Helen J.

AU - Schlemmer, Stephan

AU - van Dishoeck, Ewine F.

AU - Linnartz, Harold

PY - 2006

Y1 - 2006

N2 - We present laboratory data on pure, layered and mixed CO and O-2 ices relevant for understanding the absence of gaseous O-2 in space. Experiments have been performed on interstellar ice analogues under ultra high vacuum conditions by molecular deposition at 14 K on a gold surface. A combination of reflection absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD) is used to derive spectroscopic and thermodynamic properties of the ices. It is found that for pure ices the desorption energy of O-2 is larger than that of CO and N-2. TPD spectra reveal similar desorption processes for all examined CO - O-2 ice morphologies. The different amorphous and crystalline components of pure (CO)-C-13 RAIR spectra are analyzed. The RAIRS data of the (CO)-C-13 stretching vibration show a significant difference between layered and mixed CO - O-2 ices: layered CO - O-2 ices resemble that of pure (CO)-C-13 whereas the spectra of mixed ices are broadened. The experiments also show that the sticking probabilities of O-2 on CO and O-2 on O-2 are close to unity. These new results are compared with recently analyzed data of CO - N-2 ices.(1,2) The differences in the TPD and RAIRS spectra of the CO - N-2 and CO - O-2 ice systems are explained by differences in quadrupole intermolecular interactions and by different crystallization processes of these ices.

AB - We present laboratory data on pure, layered and mixed CO and O-2 ices relevant for understanding the absence of gaseous O-2 in space. Experiments have been performed on interstellar ice analogues under ultra high vacuum conditions by molecular deposition at 14 K on a gold surface. A combination of reflection absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD) is used to derive spectroscopic and thermodynamic properties of the ices. It is found that for pure ices the desorption energy of O-2 is larger than that of CO and N-2. TPD spectra reveal similar desorption processes for all examined CO - O-2 ice morphologies. The different amorphous and crystalline components of pure (CO)-C-13 RAIR spectra are analyzed. The RAIRS data of the (CO)-C-13 stretching vibration show a significant difference between layered and mixed CO - O-2 ices: layered CO - O-2 ices resemble that of pure (CO)-C-13 whereas the spectra of mixed ices are broadened. The experiments also show that the sticking probabilities of O-2 on CO and O-2 on O-2 are close to unity. These new results are compared with recently analyzed data of CO - N-2 ices.(1,2) The differences in the TPD and RAIRS spectra of the CO - N-2 and CO - O-2 ice systems are explained by differences in quadrupole intermolecular interactions and by different crystallization processes of these ices.

KW - interstellar clouds

KW - spectroscopy

KW - thermal desorption

KW - molecular clouds

KW - grain mantles

U2 - 10.1039/b517262b

DO - 10.1039/b517262b

M3 - Article

VL - 133

SP - 331

EP - 345

JO - Faraday Discussions

T2 - Faraday Discussions

JF - Faraday Discussions

SN - 1359-6640

ER -

Fuchs GW, Acharyya K, Bisschop SE, Oeberg KI, van Broekhuizen FA, Fraser HJ et al. Comparative studies of O-2 and N-2 in pure, mixed and layered CO ices. Faraday Discussions. 2006;133:331-345. https://doi.org/10.1039/b517262b