Laser desorption time-of-flight mass spectrometry of vacuum UV photo-processed methanol ice

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Volume 592 (August 2016)

A&A, 592 (2016) A67

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Table 1

Overview of recent studies focusing on energetically processing methanol ice using a variety of detection techniques.

	Öberg et al.¹	Boamah et al.²	Maity et al.³	Henderson & Gudipati⁴	This work
	(2009)	(2014)	(2015)	(2015)
Energetic processing:	VUV	20 eV electrons	2 keV electrons	2 keV electrons, VUV^A	VUV
Detection technique(s):	TPD/QMS	TPD/QMS	TPD/SPI TOF-MS	2S-LAIMS^B	LDPI TOF-MS
Molecule	and IR		and IR

Carbon monoxide (CO)	Y		Y	Y?	Y
Methane (CH₄)	Y		Y	Y	Y
Ethane (C₂H₆)				Y?	?
Carbon dioxide (CO₂)	Y		Y	Y?	Y
Formaldehyde (H₂CO)	Y	Y	Y	Y	Y
Dimethyl ether (CH₃OCH₃)	Y	Y	Y		Y
Acetaldehyde (CH₃CHO)	Y	Y	Y	Y?	Y
Methyl formate (HCOOCH₃)	Y?	Y	Y	Y?	Y
Ethanol (CH₃CH₂OH)	Y	Y	Y		Y
Water (H₂O)				Y	Y
Ketene (H₂CCO)			Y
Formic acid (HCOOH)	Y?				Y?
Acetic acid (CH₃COOH)	Y?	Y?			Y
Glycolaldehyde (HOCH₂CHO)	Y?	Y?	Y		Y
Methoxymethanol (CH₃OCH₂OH)		Y	Y		Y?
Ethylene glycol (CH₂OH)₂	Y	Y	Y		Y
Glycolic acid (HOCH₂COOH)		Y?
Glycerin (HOCH₂CHOHCH₂OH)		Y?	Y		Y

Notes.

⁽¹⁾

Öberg et al. (2009).

⁽²⁾

Boamah et al. (2014).

⁽³⁾

Maity et al. (2014).

⁽⁴⁾

Henderson & Gudipati (2015).

^(A)

In this study, 2 keV electrons are also used as energetic processing yielding a high degree of complexity, such as ethenone, glycolaldehyde, methyl acetate, ethyl acetate, and CH₃CO, as well as other species that are only tentatively identified.

^(B)

2S-LAIMS: two-step laser ablation and ionisation mass spectrometry.

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