Infrared spectrum of formamide in the solid phase

Sivaraman, Bhalamurugan; Sekhar, B. N. Raja; Nair, B. G.; Hatode, V.; Mason, Nigel J.

doi:10.1016/j.saa.2012.12.039

Cited by 32 publications

(24 citation statements)

References 16 publications

(28 reference statements)

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“…Figure 1 shows the IR spectrum of a 29 ML thick NH 2 CHO film deposited at 12 K. The fundamental vibration modes of NH 2 CHO are identified to be in agreement with previous measurements (Brucato et al 2006;Sivaraman et al 2013;Urso et al 2017) and are labeled in Fig. 1.…”

Section: Resultssupporting

confidence: 86%

Destruction route of solid-state formamide by thermal H atoms

Suhasaria

Mennella

2020

A&A

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Context. Formamide (NH2CHO) is one of the simplest “CHON” molecules that has been observed in different environments in space. In star-forming regions, its abundance in the gas phase is correlated to isocyanic acid (HNCO), indicating a chemical relation between the two species. Many studies have investigated the different routes for the transformation of the two species from one to the other. Aims. We carry out an experimental analysis on the interaction of atomic H at 300 K with solid NH2CHO to probe whether HNCO can form. Methods. The effects of H atom irradiation on NH2CHO have been analyzed by Fourier-transform infrared spectroscopy. Results. During irradiation, a decrease in the band intensity of the C–H, C=O, and N–H modes of NH2CHO with a simultaneous increase in the N=C=O band intensity of HNCO is observed, indicating a transformation of NH2CHO to HNCO. The corresponding destruction and formation cross-sections have been estimated from the trend of the normalized column densities as a function of the H atom fluence. The transformation follows a three-step reaction sequence driven by H atom exothermic abstractions that also induce sputtering of the products. No bands of aminomethanol were detected. Conclusions. The interaction of H atoms with NH2CHO in space can be one of the promising mechanisms to explain the chemical relation between NH2CHO and HNCO. In addition, the comparison of our results with those of other energetic processing agents suggests that H atoms play a crucial role in the destruction of NH2CHO ice in dense regions of the interstellar medium.

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Section: Resultssupporting

confidence: 86%

Destruction route of solid-state formamide by thermal H atoms

Suhasaria

Mennella

2020

A&A

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“…2009). The contribution from dimer molecules cannot be neglected as it is well known (Sivaraman et al 2012;Sivaraman et al 2013) in such low temperature molecular ices where the deposited parent molecule containing H, O and C atoms are known to have different sets of dimers (conformers). 12.4 µm), 1362 cm -1 (7.3 µm), 1439 cm -1 (6.94 µm) and 2982 cm -1 (3.35 µm) can be used.…”

Section: Resultsmentioning

confidence: 99%

Infrared spectra and chemical abundance of methyl propionate in icy astrochemical conditions

Sivaraman

Radhika

Das

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We carried out an experiment in order to obtain the InfraRed (IR) spectra of methyl propionate (CH3CH2COOCH3) in astrochemical conditions and present the IR spectra for future identification of this molecule in the InterStellar Medium (ISM). The experimental IR spectrum is compared with the theoretical spectrum and an attempt was made to assign the observed peak positions to their corresponding molecular vibrations in condensed phase. Moreover, our calculations suggest that methyl propionate must be synthesized efficiently within the complex chemical network of the ISM and therefore be present in cold dust grains, awaiting identification.

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“…H interaction observed in formamide ices. 13,24 The spectra at 90 K and at 100 K suggest reorientation has occurred within the ice matrix of methanethiol and from this we could conclude that there is a phase change from amorphous to crystalline, ortho-rhombic structure. 25 Methanethiol molecules started subliming off from the substrate above 120 K and all the ice has sublimed by 150 K.…”

Section: A Methanethiolmentioning

confidence: 94%

Communication: Vacuum ultraviolet photoabsorption of interstellar icy thiols

Bhuin

Sivaraman

et al. 2014

The Journal of Chemical Physics

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Following the recent identification of ethanethiol in the interstellar medium (ISM) we have carried out Vacuum UltraViolet (VUV) spectroscopy studies of ethanethiol (CH3CH2SH) from 10 K until sublimation in an ultrahigh vacuum chamber simulating astrochemical conditions. These results are compared with those of methanethiol (CH3SH), the lower order thiol also reported to be present in the ISM. VUV spectra recorded at higher temperature reveal conformational changes in the ice and phase transitions whilst evidence for dimer production is also presented.

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Infrared spectrum of formamide in the solid phase

Cited by 32 publications

References 16 publications

Destruction route of solid-state formamide by thermal H atoms

Destruction route of solid-state formamide by thermal H atoms

Infrared spectra and chemical abundance of methyl propionate in icy astrochemical conditions

Communication: Vacuum ultraviolet photoabsorption of interstellar icy thiols

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