High-sensitivity detection of NO in a flame using a tunable ArF laser.
A tunable, narrow-band ArF laser has been used for laser-induced fluorescence detection of NO in natural abundance in a flame experiment. P and R branches of the D(2)Sigmaupsilon' = 0?X(2)Pi(3/2,1/2)upsilon'' transition were observed probing rotational states between J'' = 19.5 and J'' = 44.5. A single-shot detection limit of 1 part in 10(6) was found with a monochromator-based, dispersed-fluorescence detection system. In an experimental setup, determination of undispersed laser-induced fluorescence detection limits at or below the 1-part-in-10(9) range should be possible, because the narrow-band laser can be used to suppress all other sources of contaminating fluorescence even for detection of trace NO. The NO B(2)Piupsilon' = 7 ? X(2)Piupsilon'' = 0 transition was also observed in a cell experiment but not in the flame and is reported here.
Wodtke
A M
AM
Huwel
L
L
Schluter
H
H
Meijer
G
G
Andersen
P
P
Voges
H
H