Table 1. Photochemical Products Characterized by GC-MS during the Hydrogen-Rich and Hydrogen-Poor Experiments^a.

compound	hydrogen-rich	hydrogen-poor	(6 h)	(24 h)
C2H2	√	√	(+)	(+)
C2H4	√	√	(+)	(+)
C2H6	√	√	(−)	(+)
C3H8	√	√	(−)	(+)
n-C4H10	√	√	(−)	(+)
iso-C4H10	√	√	(−)	(+)
n-C5H12	√	×	×	×
iso-C5H12	√	×	×	×
HCN	√	×	×	×
CH3CN	√	√	(−)	(−)

^aFor products detected in both experiments, (+) and (−) indicate if more or less of that product was detected in the hydrogen-poor experiments compared to that in the hydrogen-rich experiments at hour 6 and hour 24.