Table 7. Percent Yield (Slope of Regression +/- Standard Error of Slope) on a Mole Basis, of Product Ions From Terpene Photooxidation That Were Also Observed in the Ambient Air Within a Ponderosa Pine Canopy in California								
Terpene	m/z 111	m/z 113	m/z 123	m/z 141	m/z 151	m/z 155	m/z 159	m/z 169
beta-caryophyllenea		0.4 +/- 0.1 		0.4 +/- 0.1				
alpha-humulenea		1.1 +/- 0.3		1.1 +/- 0.2	1.5 +/- 0.3		0.3 +/- 0.1	0.5 +/- 0.2
longifolene		0.7 +/- 0.1						
limonene	1 +/- 0.2	1 +/- 0.2	21 +/-  4b	1.3 +/- 0.3	13 +/-  3	0.7 +/- 0.2	0.1 +/- 0.02	4.6 +/- 1
myrcene 	9.3 +/- 2c	32 +/- 7	5.5 +/- 1	0.6 +/- 0.2		1.1 +/- 0.3	0.1 +/- 0.02	
3-carene	1.7 +/- 0.4	2 +/- 0.4	26 +/- 6	4.5 +/- 1	19 +/-  4	0.8 +/- 0.2		6.9 +/- 2
methyl chavicol		0.9 +/- 0.1	0.5 +/- 0.04		23 +/- 0.4			
alpha-pinene	1 +/- 0.2	0.9 +/- 0.2	3.6 +/- 0.7	1 +/- 0.2	24 +/- 5	0.8 +/- 0.2		2.4 +/- 0.5
terpinolene 	29 +/- 6d	2.8 +/- 0.6	1.7 +/- 0.4	1.7 +/- 0.4				
beta-pinene	0.7 +/- 0.2	0.4 +/- 0.1	1.1 +/- 0.2		1.4 +/- 0.3	0.8 +/- 0.2		
gamma-terpinene	0.4 +/- 0.1	1 +/- 0.2	17 +/- 4	2.2 +/- 0.5	14 +/- 3	0.7 +/- 0.1	0.1 +/- 0.02	14 +/- 3
alpha-terpinene	0.6 +/- 0.1	0.6 +/- 0.2	7.2 +/- 2	0.9 +/- 0.4	4.6 +/- 1	3.4 +/- 1	0.1 +/- 0.03	2.7 +/- 1
verbenonea	3.2 +/- 0.7	6.5 +/- 1		1.8 +/- 0.4		1.5 +/- 0.3	0.2 +/- 0.04	0.4 +/- 0.1
linaloola	20 +/- 4e	2.5 +/- 0.5	0.7 +/- 0.1	0.5 +/- 0.1	0.4 +/- 0.1		0.04 +/- 0.02	0.3 +/- 0.1
isoprene		0.6 +/- 0.1
aThe terpenes listed in italic font have not been measured in the air above the Blodgett Forest canopy. The short lifetime of the two sesquiterpenes, beta-caryophyllene and alpha-humulene likely affect their detection in ambient air above the canopy, and linalool, typically associated with flowering citrus plants, may not be emitted at all from Blodgett Forest. Verbenone, an oxygenated terpene associated with plant-insect interactions, has not been specifically targeted for measurements at Blodgett Forest.
bYields listed in bold are yields greater than 10%, and all yields of unidentified product ions represent a lower limit due to lack of knowledge about fragmentation.
cYield of m/z 111. The sum of yields of m/z 111 and 93 is 41 +/- 7% (see text).
dYield of m/z 111. Sum of yields of m/z 111 and 93, the dehydrated fragment of m/z 111, was 43 +/- 7%.
eYield of m/z 111. The sum of yields of m/z 129, 111 and 93 is 75 +/- 10%.