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Jet-Cooled Spectroscopy of 1- Naphthylmethyl, 2-Naphthylmethyl & Acenaphthenyl Radicals Nahid Chalyavi.

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Presentation on theme: "Jet-Cooled Spectroscopy of 1- Naphthylmethyl, 2-Naphthylmethyl & Acenaphthenyl Radicals Nahid Chalyavi."— Presentation transcript:

1 Jet-Cooled Spectroscopy of 1- Naphthylmethyl, 2-Naphthylmethyl & Acenaphthenyl Radicals Nahid Chalyavi

2 2 Astrochemical Significance of PAHs Jenniskens P. et al., Ap.J., 183, 87, 1973 Diffuse Interstellar Bands Cohen M. et al., A & A, 390, 147, 2002 Red Rectangle Bands F.C. Gillett et al., Ap.J., 183, 87, 1973 Unidentified Infrared Bands Interstellar Dust Grain Model Kwok, Nature 430, 985 (2004)

3 3

4 4 Resonance-Stabilized Radicals (RSRs) Preferable product from decomposition of stable species Slower rate of reaction and dissociation compared to localized radicals Can reach high concentration in reaction environment

5 5 Supersonic Jet Expansion

6 6 Detector Source Extraction of ions Time-Of- Flight MS Resonance-Enhanced Multiphoton Ionization (REMPI) Ionisation continuum  +e - 

7 7 Laser-Induced Fluorescence (LIF) & Dispersed Fluorescence (DF) Spectroscopy Vibrational Coordinate Energy DF Vibrational Coordinate Energy LIF

8 8 1-Naphthylmethyl Radical LIF vs. REMPI A' = 1.987 GHz A" = 1.996 GHz B' = 1.102 GHz B" = 1.121 GHz C' = 0.709 GHz C" = 0.718 GHz A' = 1.987 GHz A" = 1.996 GHz B' = 1.102 GHz B" = 1.121 GHz C' = 0.709 GHz C" = 0.718 GHz Band Type: a/b=1.325 Band Origin: 17240.68 cm -1

9 9 Dispersed Fluorescence (DF)

10 10 Comparison with RR and DIB Bands The Red Rectangle Emission wavelength has been corrected for the speed of nebulae (18.9 km/sec) The Red Rectangle Emission wavelength has been corrected for the speed of nebulae (18.9 km/sec)

11 11 2-Naphthylmethyl Radical LIF vs. REMPI

12 12 Dispersed Fluorescence (DF)

13 13 Comparison with RR and DIB Bands

14 14 Acenaphthenyl Radical LIF vs. REMPI

15 15 Dispersed Fluorescence (DF)

16 16 Comparison with RR and DIB Bands

17 17 Conclusions & Future Work Jet-cooled spectroscopy of three resonance-stabilized radicals containing naphthalene moiety has been studied A coincidence is found between 1-naphthylmethyl radical origin transition and a red rectangle emission band The coincidence suggests that some structures similar to these radicals might be the carriers of red rectangle bands Consider other resonance-stabilized radicals with similar structures

18 18 Acknowledgements Dr. Timothy Schmidt Dr. Rob Sharp Dr. Masakazu Nakajima The Laser Spectroscopy Group

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