1. IDENTIFYING FLUORESCENT HYDROCARBON RADICALS FROM A BENZENE DISCHARGE. Neil J. Reilly, Damian L. Kokkin, Scott H. Kable & Timothy W. Schmidt (Not)

3. Diffuse interstellar bands… http://bjm.scs.uiuc.edu/research/opb2.php

4. What is this molecule?

5. Benzene discharge (2d) 99989998 99979997 10101010 10111011 21212121 21202120 21222122 Rotational branch trails C3C3 C2C2

6. Benzene discharge ?

8. Emission wavelength (nm) Excitation wavelength (nm)

9. Benzene discharge Claude Monet. Water-Lilies. 1914. Oil on canvas. National Museum of Western Art, Tokyo, Japan.

10. Benzene discharge C3C3 ? ? ? ? ?

11. C2C2 ? ? ? ? ? ? ? ?

12. origin DF C2C2 C2C2

13. Benzene discharge C2C2 ? ? ? ? ? ? ? ? ? = same molecule!

14. C 6 H 6 discharge Our origin band DIB

15. Benzene discharge C2C2

16. C2C2

17. C6H6C6H6 C6H5DC6H5D C6D6C6D6

18. C6H6C6H6 C6H5DC6H5D C6D6C6D6

19. C6H6C6H6 C6H5DC6H5D C6D6C6D6 CnH6?CnH6?

21. Coincidence? Both spectra generated from C 6 H 6 discharge Both coincident with broad DIBs What could be the broadening mechanism? Inefficient radiative cooling? We’ll try to get a R2C2PI spectrum later this year… I’ll tell you what it is next year