Table 8. Comparison of Gas-Phase Oxidation Product Yields From Sesquiterpenes, Isoprene, and Oxygenated Terpenes, on a Percent Mole (ppb/ppb) Basis, Observed in This Study With Results From Other Terpene Photooxidation Experiments				
Terpene	Product	Product Yield, % 		
This Work	Product Yield, %			
Other Studies	Reference			
alpha-humulene	m/z 219	3 +/- 0.5	9.5a	[Jaoui and Kamens, 2003a]
linalool	acetone	25	51	[Shu et al., 1997]
	m/z 127	8.1 +/- 2	6.8b	[Shu et al., 1997]
	m/z 129, 111, 93	75 +/- 10	46c	[Shu et al., 1997]
isoprene	formaldehyde	160d		
	63 +/- 10			
57 +/- 6	[Tuazon and Atkinson, 1990]			
[Miyoshi et al., 1994]				
	MVK + MACR	60 - 87 +/- 11		
	61			
55 +/- 6				
54 				
54	[Paulson et al., 1992]			
[Zhao et al., 2004]				
[Tuazon and Atkinson, 1990]				
[Miyoshi et al., 1994]				
	3-methylfuran	3.6 +/- 0.4		
	4.4 +/- 0.6			
4 +/- 2				
< 2	[Atkinson et al., 1989]			
[Paulson et al., 1992]				
[Sprengnether et al., 2002]				
	m/z 85	1.5 +/- 0.3	8.4 +/- 2.4e	[Zhao et al., 2004]
	m/z 87	1.3 +/- 0.3	3.3 +/- 1.6f	[Zhao et al., 2004]
	m/z 101	0.5 +/- 0.1	~ 15%g	
19.3 +/- 6.1h	[Baker et al., 2005]			
[Zhao et al., 2004]				
aSum of yields of 3-seco-alpha-humulone aldehyde and 7-seco-alpha-humulone aldehyde, and alpha-humulal aldehyde, all with MW = 236. We did not observe m/z 237, but did observe m/z 219, its dehydrated fragment.
bYield of 6-methyl-5-hepten-2-one (C8H14O = 126 amu).
cYield of 4-hydroxy-2-methyl-5-hexen-1-al and its cyclized isomer (C7H12O2 = 128 amu).
dLikely overestimated due to calibration issue.
eYield of m/z 85 measured by PTR-MS and attributed to a C5 carbonyl (C5H8O = 84 amu).
fYield of m/z 87 measured by PTR-MS and attributed to a C4 hydroxycarbonyl (C4H6O2 = 86 amu).
gEstimated yield of two C5 hydroxycarbonyls.
hYield of m/z 101 measured by PTR-MS and attributed to a C5 hydroxycarbonyl (C5H8O2 = 100 amu).