H<sub>2</sub>MOLECULAR CLUSTERS WITH EMBEDDED MOLECULES AND ATOMS AS THE SOURCE OF THE DIFFUSE INTERSTELLAR BANDS

Bernstein, L. S.; Clark, F. O.; Lynch, D. K.

doi:10.1088/0004-637x/768/1/84

Cited by 19 publications

(18 citation statements)

References 59 publications

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“…Lin et al (2011) proposed to track H 6 + as a probe for the presence of solid H 2 . Bernstein et al (2013) proposed the presence of contaminated CHIMPs. Molecules that are embedded in CHIMPs are in conditions very close to the H 2 matrix experiments.…”

Section: Astrophysical Implicationsmentioning

confidence: 99%

“…In addition to the few layers adsorbed on water ice mentioned earlier, the presence of solid H 2 was proposed as flakes (Pfenniger & Puy 2003) or as H 2 dust stabilised by an electric field (Walker 2013), forming contaminated H 2 clusters (Bernstein et al 2013). The later study proposed the presence of seeds in the ISM, where H 2 molecules can be accreted until forming cubic centimeter-sized objects called contaminated H 2 ice macro-particles (CHIMPs).…”

Section: Introductionmentioning

confidence: 95%

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CN radical hydrogenation from solid H₂ reactions, an alternative way of HCN formation in the interstellar medium

Borget

Müller

Grote

et al. 2017

A&A

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Context. Molecular hydrogen (H 2 ) is the most abundant molecule of the interstellar medium (ISM) in gas phase and it has been assumed to exist in solid state or as coating on grains. Aims. Our goal is to show that solid H 2 can act as a hydrogenation agent, reacting with CN radicals to form HCN. Methods. In a H 2 matrix, we studied the hydrogenation of the CN radical generated from the vacuum ultraviolet photolysis (VUVphotolysis) of C 2 N 2 at 3.8 K. We modified the wavelengths and the host gas in order to be sure that CN radicals can abstract H from H 2 molecules. Results. HCN monomers, dimers, and oligomers have been characterised by Fourier transform infrared spectroscopy (FTIR). H 2 CN as well as CN radicals have also been clearly observed during the photolysis performed at 3.8 K.Conclusions. H 2 is a hydrogenation reagent towards CN radicals producing HCN. This type of reaction should be taken into account for the reactivity at low temperature in contaminated H 2 ice macro-particles (CHIMPs), H 2 flakes or in the first sublayers of grains where solid H 2 has accumulated.

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Section: Astrophysical Implicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

CN radical hydrogenation from solid H₂ reactions, an alternative way of HCN formation in the interstellar medium

Borget

Müller

Grote

et al. 2017

A&A

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“…We realized the same experiment in H 2 matrix. In ISM, H 2 is the most abundant molecule, and it supposed to exist in solid state as flakes [42] or contaminated H 2 ice macroparticles [43] or as sublayers on the ISM grains. [44,45] We observed the direct reaction of the CN radical with H 2 forming HCN as monomer and oligomers.…”

Section: Reaction With Hmentioning

confidence: 99%

What are the intermediates that could react in the interstellar ices?

Borget

Duvernay

Danger

et al. 2014

J of Physical Organic Chem

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“…Subsequent studies of "condensed" H2 have been predominantly concerned with the distinct case of H2 molecules adsorbed onto other materials -either individual atoms/molecules/ions (e.g. Duley 1996; Bernstein, Clark and Lynch 2013), or else the surfaces or porous matrices of other solids (e.g. Sandford and Allamandola 1993).…”

Section: Introductionmentioning

confidence: 99%

The infrared dielectric function of solid para-hydrogen

Kettwich¹,

Anderson²,

Walker³

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We report laboratory measurements of the absorption coefficient of solid para-H 2 , within the wavelength range from 1 to 16.7 µm, at high spectral resolution. In addition to the narrow rovibrational lines of H 2 which are familiar from gas phase spectroscopy, the data manifest double transitions and broad phonon branches that are characteristic specifically of hydrogen in the solid phase. These transitions are of interest because they provide a spectral signature which is independent of the impurity content of the matrix. We have used our data, in combination with a model of the ultraviolet absorptions of the H 2 molecule, to construct the dielectric function of solid para-H 2 over a broad range of frequencies. Our results will be useful in determining the electromagnetic response of small particles of solid hydrogen. The dielectric function makes it clear that pure H 2 dust would contribute to IR extinction predominantly by scattering starlight, rather than absorbing it, and the characteristic IR absorption spectrum of the hydrogen matrix itself will be difficult to observe.

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H₂MOLECULAR CLUSTERS WITH EMBEDDED MOLECULES AND ATOMS AS THE SOURCE OF THE DIFFUSE INTERSTELLAR BANDS

Cited by 19 publications

References 59 publications

CN radical hydrogenation from solid H₂ reactions, an alternative way of HCN formation in the interstellar medium

CN radical hydrogenation from solid H₂ reactions, an alternative way of HCN formation in the interstellar medium

What are the intermediates that could react in the interstellar ices?

The infrared dielectric function of solid para-hydrogen

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H2MOLECULAR CLUSTERS WITH EMBEDDED MOLECULES AND ATOMS AS THE SOURCE OF THE DIFFUSE INTERSTELLAR BANDS

Cited by 19 publications

References 59 publications

CN radical hydrogenation from solid H2 reactions, an alternative way of HCN formation in the interstellar medium

CN radical hydrogenation from solid H2 reactions, an alternative way of HCN formation in the interstellar medium

What are the intermediates that could react in the interstellar ices?

The infrared dielectric function of solid para-hydrogen

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H₂MOLECULAR CLUSTERS WITH EMBEDDED MOLECULES AND ATOMS AS THE SOURCE OF THE DIFFUSE INTERSTELLAR BANDS

CN radical hydrogenation from solid H₂ reactions, an alternative way of HCN formation in the interstellar medium

CN radical hydrogenation from solid H₂ reactions, an alternative way of HCN formation in the interstellar medium