ELECTRONIC SPECTROSCOPY of CARBON CHAINS of ASTROPHYSICAL RELEVANCE

CHCCCCC Electronic Spectrum ? ? ?

PMT Laser beam nozzle valve Gas inlet cavity HV 2  X 2  C 6 H, C 8 H, C 10 H, C 12 H HCCH / Ar

CRDS Discharge pulse 30 μs Time cm -1

Absorbance nm C6–C6– HC 6 H + HC 4 CN + C6HC6H Absorption Spectra in 5 K Neon Matrix 2  X 2  C6HC6H

nm / /247/2 5/271/2 3/2  = 3/2  = 1/2 Gas Phase C6HC6H 2  X 2  Absorption in 5 K Neon Matrix0 0

CRDS Discharge pulse 30 μs Time cm -1

DFWM ω pump ω probe =

1 Λ θ θBθB 2 3 4

DFWM signal DFWM laser

CRDS DFWM cm -1 C4HC4H C3C3 Discharge pulse Discharge pulse Discharge pulse 9 μs 7 μs 30 μs Time < 1 μs Laser

1 Λ θ θBθB 2 3 4

TC-RFWM UP SEP ω pump ω probe ω pump ω probe

Wavenumber (cm -1 ) 2 Σ + 2 Π 2 Σ + 2 Σ + X 2 Σ + PUMP C4HC4H

C 2 H 2 /He C 2 D 2 /He Intensity [a.u.| Wavelength [nm] H. Linnartz, N. Wehres, H. Van Winckel, G.A.H. Walker, D.A. Bohlender, A.G.G.M. Tielens, T. Motylewski and J.P. Maier, Astron. Astrophys, 511, L3, 2010 A DIB

nm C C C H H B 1 B 1 X 1 A 1 ~~ A 1 A 2 X 1 A 1 ~~ C 1 A 1 X 1 A 1 ~~ J. A. Hodges, R. J. McMahon, K. W. Sattelmeyer, J. F. Stanton Ap J, 544, 838, 2000

cm cm -1 K a = 1-0 K a = 0-1 K a = 1-0 K a = 2-1 A 1 A 2 X 1 A 1 ~~ C C C H H

B 1 A 1 A 2 X 1 A cm cm -1 ~ ~ ~ C C C H H

1A21A2 B2B2 B1B1 B1B1 1A11A1 b b b ≤ a- b- c- 1 B 1 a 2 ~16161 Γ state ΓvΓv A ~ B ~ X ~ ΓvΓv Vibronic interactions Coriolis interactions C C C H H

C C C H H H H H H hv Wavelength (Å) Absorbance B 1 B 1 X 1 A 1 ~~ 6 K Neon Matrix A 1 A 2 X 1 A 1 ~~ C C C D D C3H2+C3H2+ mass-selection

ÅÅ B 1 B 1 X 1 A 1 ~~ l – C 3 H CRD C C C D D H H H H

Wavelength (Å) Relative Intensity 5 % HD HD HD γ Ori C C C H H

Å Å K a = 2-1 K a = 1-0 K a = K 20 K 60 K A 1 A 2 X 1 A 1 ~~ Δλ = 0.15 Å Δλ = 0.4 Å C C C H H

Wavelength (Å) Relative Intensity 1 % HD ζ Oph (x2.5) HD HD (÷2) A 1 A 2 X 1 A 1 ~~ 10 K, Δλ = 0.15 Å C C C H H

C C C H H B 1 B 1 X 1 A 1 ~~ f ~ (theory) N (cm -2 ) = 1.13  N ( l –C 3 H 2 ) ~ 5  cm -2 EW (Å) Λ (Å) 2  f towards HD Franck-Condon factor 2 0 ~ 0.2 total 1 f (2 0 ) ~

Magnetic BenderQuadrupole22-Pole Trap (6 K)HV ElectrodeQuadrupole Ion sourceHexapoleHelium InletLaserPhotomultiplierLenses

D 2 Π u B 2 Σ u + A 2 Σ g + C 2 Π u X 2 Π g E / cm -1 ~ C N 2 NCCN +

D 2 Π u B 2 Σ u + A 2 Σ g + C 2 Π u X 2 Π g E / cm -1 ~ C N 2 UV NCCN +

nm NCCN / * * * B 2 Σ u + X 2 Π g

nm NCCN + B 2 Σ u + – X 2 Π 3/2,g 0 0

NCCN + ~ 890 nm 355 nm NC + + CN ps C 2 Π u B 2 Σ u + A 2 Σ g + X 2 Π g ~ 2000 cm -1

nm HCCCCCCCCCCCCH A 2  u X 2  g n nm

B 2 Π g A 2 Π g C 2 Π g X 2 Π u E/eV HC 10 H + C 7 H C 3 C 7 H + + C 3 H

B 2 Π g A 2 Π g C 2 Π g X 2 Π u E/eV HC 10 H + C 7 H C 3 C 7 H + + C 3 H

ν/cm ν/cm HC8H+HC8H+ B 2 Π u X 2 Π g0 0 HC 10 H + B 2 Π g X 2 Π u0 0 HC 10 H + C 2 Π g X 2 Π u0 0 HC 12 H + D 2 Π u X 2 Π g0 0 ~ ~

nm C 4 H + counts 0 0 HC4H+HC4H+ A 2 Π u X 2 Π g ~~ nm Simulation ~ 20 K; 0.4 cm -1

Å Å DIB 10 K 60 K 0 0 HC4H+HC4H+ A 2 Π u X 2 Π g ~~ J. Krelowski et al., Ap. J., 714, L64, 2010

A 2 Π 3/2 v 3 = 1 A 2 Π 1/2 v = 0 A 2 Π 3/2 v = 0 X 2 Π 1/2 v = 0 X 2 Π 3/2 v = 0 ~ 800 cm cm cm -1 Magnetic dipole rate ~10 -6 s -1 R 1 max ~ Å H C C C C H +

A 2 Π u X 2 Π g ~~ H C C C C H Wavelength (Å) 30 K 60 K 30 K Π 3/2 and 2 Π 1/2 2 Π 3/2 T rot = T s-o DIB‘s 2 Π 3/2 2 Π 1/2 ~ 33 cm -1 Magnetic dipole 0 0

M.D. Morse & J.P. Maier, Ap J, 731, 1, 2011

Dr. Rainer DIETSCHE PD Dr. Jan FULARA Dr. Fabio MAZZOTTI Dr. Corey RICE Satrajit CHAKRABARTY Iryna GARKUSHA Adam NAGY Ranjini RAGHUNANDAN

M.D. Morse & J.P. Maier, Ap J, 731, 1, 2011

M.D. Morse & J.P. Maier, Ap J, 731, 1, 2011