Electronic Spectroscopy of Mass-Selected C 7 H 3 + and C 7 H 3 Isomers in 6 K Neon Matrices.

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Presentation transcript:

Electronic Spectroscopy of Mass-Selected C 7 H 3 + and C 7 H 3 Isomers in 6 K Neon Matrices

Freivogel, Fulara, Lessen, Forney, Maier, Chem. Phys. 1994, 189: 335; Fulara, Nagy, Garkusha, Maier, J. Chem. Phys. 2010, 133: −5 mbar 10 −8 mbar ION SOURCE DEFLECTOR MASS FILTER MATRIX ELECTROSTATIC LENSES Ne

GRATING TURRET FIBER BUNDLE DIFFUSER LIGHT SOURCE SPECTROGRAPH CUT-OFF FILTERS MANUAL SHUTTER MATRIX 250 ‒ 1100 nm resolution ~0.1 nm Fulara, Nagy, Garkusha, Maier, J. Chem. Phys. 2010, 133:

150 μm N neon /N ion ≅ 10 6 −10 8 (10 13 −10 16 ions/cm 3 ) Neutralization  electron scavenger (CH 3 Cl + e −  CH 3 + Cl − ) UV irradiation (mpHg lamp 5.4 eV)  cations/ neutrals Laser induced fluorescence  selective excitation of single species Matrix, 6 K

Wavelength [nm] Absorbance H-Cor H-Cor + deposition irradiation H

C7H3+C7H3+ C7H3.C7H3.

nm HC 7 H + Absorbance 90 eV uv + h 50 eV C7H3+C7H3+

A + (0,0) A  (86,160) A - (210) B + (15,61) B  (0,52) B - (35) C + (46,69) C  (28,29) C - (0) F + (14,25) F  (104,134) F - (235) E + (381,452) E  (34,281) E - (124) J + (73,40) J  (-,0)

nm A 1 X 1 A A' X 1 A' Absorbance C7H3+C7H3+ + +

nm Absorbance A' X 2 A' 2 B 1 X 2 B A' X 2 A' C2+C2+ C7H3.C7H3.

nm A 1 X 1 A 1 2 B 1 X 2 A 2 A+A+ A.A. Absorbance C7H3+C7H3+ +

Dr. Jan FULARA Iryna GARKUSHAPhD Adam NAGYPhD Arghya CHAKRABORTY KarolFILIPKOWSKI