Table 4. Molecular Weights Associated With Other Terpenes Detected by PTR-MS			
Compound	m/z (mass + 1)	Structure	Description
methyl chavicol	149a, 150 	C10H12OH+	oxygenated terpene and isotope
	65, 71, 73, 75, 85, 89, 97, 99, 101, 103, 109 b, 113, 121, 123c*, 124d, 125, 129, 131, 137, 151*, 153, 163, 165, 168d, 170d, 182d		unidentified oxidation products
verbenone	109, 110, 123, 133, 151, 152	C10H14OH+	oxygenated terpene, fragments, and isotopes
	69, 71, 73, 75, 77, 83, 85, 87, 89, 93, 94, 97, 99, 100, 101, 107, 111*, 113*, 115, 123*, 124, 125, 127, 129, 130, 141*, 143, 144, 145, 151*, 152, 153, 159*, 167, 169*, 185, 230d		unidentified oxidation products
linalool	81, 82, 137, 138, 155, 156, 	C10H18OH+,	
C10H16H+	oxygenated terpene, fragments, and isotopes		
	60, 69, 71, 72, 73, 74, 75, 77, 79, 83, 85, 87, 89 ,93, 97, 99, 101, 107, 111*, 113*, 115, 123*, 124, 125, 127, 129, 141*, 143, 145, 151*, 153, 159*, 167, 169*, 185, 187, 188d		unidentified oxidation products
isoprene	69, 70	C5H8H+	isoprene and isotope
	 71, 72	C4H6OH+	MVK + MACR
	83, 84	C5H6OH+	3-methyl furan
	57, 63, 65, 73, 75, 77, 79, 85, 86, 87, 89, 97, 99, 101, 103, 105, 113*, 115, 117, 129, 133		unidentified oxidation products
aIons associated with parent terpenes listed in bold font represent ions > 20% of the unfragmented parent terpene.			
bUnidentified oxidation products in bold font are ions with > 5% yield (on a mole basis) from the parent terpene.  			
cUnidentified oxidation products with asterisks represent ions that were observed in the canopy air of a coniferous forest in California by PTR-MS [Holzinger et al., 2005]. 			
dEven mass-to-charge ratio oxidation products that are not carbon isotopes of other oxidation products are likely gas-phase nitrogen containing products, e.g., organic nitrates.