Astrophysics & Astrochemistry Cavity Ring Down Spectroscopy talks... · 2006-11-01 · Astrophysics...
Transcript of Astrophysics & Astrochemistry Cavity Ring Down Spectroscopy talks... · 2006-11-01 · Astrophysics...
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Astrophysics & AstrochemistryCavity Ring Down Spectroscopy
Harold Linnartz[[email protected]]
Sackler Laboratory for Astrophysics, Leiden Observatory, the Netherlands
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GASPHASE MOLECULES & GRAINS, DUST AND ICES
EXTREME CONDITIONS
- Very low densities- Low temperatures - High radiation fields- Limited number of
elements.
DENSE CLOUDS
DIFFUSE CLOUDS
Chemistry driven by ion-molecule reactions and (in ices) on surfaces
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GASPHASE MOLECULES & GRAINS, DUST AND ICES
EXTREME CONDITIONS
- Very low densities- Low temperatures - High radiation fields- Limited number of
elements.
DENSE CLOUDS
DIFFUSE CLOUDS
Chemistry driven by ion-molecule reactions and (in ices) on surfaces
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Matrix (solid state) workMatrix (solid state) work
Mass selective spectra.Mass selective spectra.High molecular densities High molecular densities (10(101515 / 10/ 101616 part./cmpart./cm33).).Low resolution.Low resolution.Interaction with matrix Interaction with matrix environment:environment:-- no rotational spectrano rotational spectra-- matrix shiftsmatrix shiftsHowever, indication for However, indication for region of absorption.region of absorption.
J.P. Maier, Chem. Soc. Rev. 26 (1997) 21
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Experimental procedureExperimental procedure
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Origin of the electronic transitionOrigin of the electronic transition
Rovibronic spectra give information on the electronic excitationRovibronic spectra give information on the electronic excitation, on, onthe internuclear modes and on the moment of inertia of the molecthe internuclear modes and on the moment of inertia of the molecule.ule.
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IsoIso--electronic specieselectronic species
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CW CRDS & Pulsed PlasmaCW CRDS & Pulsed Plasma
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CW CRDS & Pulsed PlasmaCW CRDS & Pulsed Plasma
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CW CRDS & Pulsed PlasmaCW CRDS & Pulsed Plasma
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Benzene plasma and 4429 DIBBenzene plasma and 4429 DIB
C.D. Ball, M.C. McCarthy, P. Thaddeus, ApJ. 528 (2000) L61
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Benzene plasma and 4429 DIBBenzene plasma and 4429 DIB
M. Araki et al. ApJ 616 (2004) 1301.
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Benzene plasma and 4429 DIBBenzene plasma and 4429 DIB
M. Araki et al. ApJ 616 (2004) 1301.
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Benzene plasma and 4429 DIBBenzene plasma and 4429 DIB
M. Araki et al. ApJ 616 (2004) 1301.
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Benzene plasma and 4429 DIBBenzene plasma and 4429 DIB
M. Araki et al. ApJ 616 (2004) 1301.
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A story without a happy end ?A story without a happy end ?
The strong DIBs are not due The strong DIBs are not due to electronic transitions of to electronic transitions of carbon chain radicals.carbon chain radicals.We learnt a lot about carbon We learnt a lot about carbon chain radicals, andchain radicals, andThe new spectra allow for a The new spectra allow for a guided search of these guided search of these species in diffuse interstellar species in diffuse interstellar clouds.clouds.Recently, CRecently, C33 has been has been detected in the diffuse detected in the diffuse interstellar medium.interstellar medium.Column densities are of the Column densities are of the order of < 10order of < 101212 cmcm22..
Astrophys. J. 553 (2001) 267
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Take home messageTake home message
Cavity Ring DownCavity Ring Down& &
Molecular Laboratory AstrophysicsMolecular Laboratory Astrophysics
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Basel:
John P. Maier
Pulsed CRD
Tomasz Motylewski
Olga Vaizert
Pawel Cias
Alexey Denisov
Mitsunori Araki
CW CRD
Petre Birza
FPM
Wayne Sinclair
David Pfluger
Dmitriy Khoroshev
Amsterdam:
Pulsed CRD
Wim Ubachs
Dmitriy Ityaksov
Jordy Bouwman
Tomas Foldes
Leiden:
IBBCEAS
Jordy Bouwman
CW-IR CRDS
Harald Verbraak
Anthony Ngai
Stefan Persijn
Frans Harren
RUN
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Thank youThank you !!
Additional information available from Additional information available from httphttp://://www.strw.leidenuniv.nl/~linnartzwww.strw.leidenuniv.nl/~linnartz
Or via eOr via [email protected]@strw.leidenuniv.nl