Question

what about the second order and the third order spectra?

Answer 1

Answer:

In a paper about optical emission spectrum of a pulsed discharge in water, the author said that: The peaks at about 620 and 927 nm are the double and triple wavelengths of the OH radical line at 309 nm, respectively, because they disappeared when a UV filter was inserted to block the 309 nm emission line.

Some authors also reported the occurrence of the 2nd order CN radical line. What's the meaning of second order? How does it happens?

Answer 2

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