Table 5. Percent Yield, on a Mole Basis, of Oxidation Product Ions From Terpene Ozonolysis That Were Also Observed in 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
3-carene	1.5 +/- 0.3	1 +/- 0.2	1.5 +/- 0.3	2.4 +/- 0.5	0.5 +/- 0.1			
alpha-terpinene		1.3 +/- 0.3	2.5 +/- 0.6	1.4 +/- 0.3	1 +/- 0.3	1.2 +/- 0.3		1.3 +/- 0.3
beta-caryophyllenea							0.3 +/- 0.1	
alpha-humulenea				0.3 +/- 0.1				
alpha-pinene	0.4 +/- 0.1	0.6 +/- 0.1		0.7 +/- 0.2		0.3 +/- 0.1		
Terpinolene	53 +/- 9b	2.8 +/- 0.6		0.6 +/- 0.1				
beta-pinene	1.1 +/- 0.3	0.4 +/- 0.1	0.5 +/- 0.3			4.7 +/- 1		0.5 +/- 0.1
Myrcene	50 +/- 8b	5.2 +/- 1.2						
Methyl chavicol					25 +/- 6			
Linaloola	50 +/- 9c	1.5 +/- 0.3						
aThe terpenes listed in italics 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.								
bThe yield of m/z 111 represents the sum of the yields from m/z 111 and m/z 93. Yields listed in bold are yields greater than 10%, and all yields of unidentified product ions represent a lower limit because of lack of knowledge about fragmentation.								
cThe yield of m/z 111 represents the sum of the yields of m/z 129, 111, and 93.