Formation rates of complex organics in UV irradiated CH3OH-rich ices - I. Experiments

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Volume 504 / No 3 (September IV 2009)

A&A, 504 3 (2009) 891-913

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Table 4:

Potential photoproducts with infrared transitions.
Species	Band	Band position	Fitting region	$\sigma$ band area	Band strength^a
		(cm^-1)	(cm^-1)	(cm^-1)	(cm^-1)
H₂O	$\nu_2$	1670	1600-1670	ul^b	$1.2\times10^{-17}$ (1)
CH₃	$\nu_2$	1385	1380-1390	ul	$6.9\times10^{-19}$ (2)
CH₄	$\nu_4$	1301	1290-1310	0.002	$1.2\times10^{-17}$ (3)
CO	$\nu_1$	2135	2125-2145	0.001	$1.1\times10^{-17}$ (1)
HCO	$\nu_1$	1850	1840-1860	0.0005	$2.1\times10^{-17}$ (2)
H₂CO	$\nu_2$	1245	1228-1265	0.01	$1.0\times10^{-18}$ (4)
CH₂OH	$\nu_4$	1195	1185-1195	0.01	$1.6\times10^{-17}$ (2)
C₂H₆	$\nu_{12}$	822	809-832	0.001	$1.6\times10^{-17}$ (5)
CO₂	$\nu_1$	2340	2330-2350	0.005	$1.2\times10^{-17}$ (1)
CH₃CHO	$\nu_7$	1350	1337-1350	0.003	$6.1\times10^{-18}$ (5)
CH₃CH₂OH	$\nu_{12}$	1380	1380-1395	0.002	$1.9\times10^{-18}$ (5)
HCOOH	$\nu_3$	1740	1739-1773	ul	$6.7\times10^{-17}$ (6)
CH₃OCH₃	$\nu_{10}$	1161	1151-1171	0.003	1.2 $\times10^{-17}$ (7)
HCOOCH₃	$\nu_9$	1214	1216-1233	ul	$2.1\times10^{-17}$ (2)
HOCH₂CHO	$\nu_{6}$	861	851-871	ul	$3.4\times10^{-18}$ (8)
CH₃COOH	$\nu_{14}$	1746/1770	1760-1772	ul	$1.1\times10^{-16}$ (9)
(CH₂OH)₂	$\nu_{14}$	866/890	851-876	0.006	$3.4\times10^{-18}$ (8)
X-CHO/X-COOH^c	CO stretch	1680-1780	-	0.01	$5.4\times10^{-17}$ (2, 6, 8)

^a The listed values are transmission band strengths, for our RAIRS experiments they are scaled by a factor of 5.5, determined empirically.
^b Only an upper limit could be determined.
^c An average of the HCOOH, HCOOCH₃ and HOCH₂CHO band strengths of 6.7, 4.8 and $4.6\times10^{-17}$ cm^-1 is used.
(1) Gerakines et al. (1995), (2) calculated band strengths from Bennett et al. (2007), (3) D'Hendecourt & Allamandola (1986), (4) Schutte et al. (1993), (5) Moore & Hudson (1998), (6) Hudson & Moore (1999), (7) from CH₃OH:CH₃OCH₃ ice mixture spectroscopy, (8) Hudson et al. (2005), (9) Maréchal (1987).

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