Comparison of UV and high-energy ion irradiation of methanol:ammonia ice

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Volume 566 (June 2014)

A&A, 566 (2014) A93

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Table 2

Assigned feature carriers of the IR-residue spectrum formed by UV irradiation of NH₃:CH₃OH = 1:1 ice.

Position	Assignment	Vibration mode	UV after dep.	Zn (620 MeV)
cm^-1

3600−2300	R-COOH, alcohols, NH^a	OH str., NH str.	×	×
2930	-CH₂OH^b	2ν₁₉ antisym. -CH₂ str.	×	×
2875	-CH₂OH^b, NH^a	ν₁₈ sym. CH₂ str., 2ν₄ of NH^a	×	×
2160	OCN⁻	CN str.	×	×
1723	Aldehydes	C=O str.	×	×
1670	Amides	C=O str.	×	×
1586	COO⁻ in carboxylic acid salts^c^d	COO⁻ antisym. str.	×	×
1454	NH^a, TMTH⁺^e	ν₄^a	×	×
1378	CH₃ groups	CH scissoring^a	×	×
1342	COO⁻ in carboxylic acid salts^c^d	COO⁻ sym. str.	×	×
1098	POM-like species^c		×	×
1050	CH2-OH in primary alcohols	C-O str.	×	×

Notes. TMTH⁺ is the protonated form of the trimethylenetriamine, C₃H₁₀N₃.

Reference.

^(a)

Wagner & Hornig (1950);

^(b)

Muñoz Caro & Dartois (2009);

^(c)

Muñoz Caro & Schutte (2003);

^(d)

Nuevo et al. (2006);

^(e)

Vinogradoff et al. (2013), and references therein.

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