Daresbury Laboratory ISSN 0962-6034

NEWSLETTER ON ANALYSIS OF ASTRONOMICAL SPECTRA

Number 22: Supplement, October 1995

Contents

LABORATORY

Gas-phase reactivity of PAH cations and transition metal cations with atomic species

N.Leymarie, H.Mestdagh, C.Rolando, M.Sablier

Organometallic species of astrophysical interest: reactivity of iron towards PAH studied at low temperature by FTIR and UV-visible matrix isolation spectroscopies

F.Elustondo, M.Dalibart, J.Mascetti, J.Deroualt

Extension of the range of microwave spectroscopy up to 1.5 THz

M.Yu.Tretyakov, A.F.Krupnov, S.A.Volokhov

The infrared spectrum of solid molecular hydrogen and its potential astrophysical implications

B.Grenier, F.Boulanger, L.d'Hendecourt, M.Jourdain de Muizon

Millimeter and submillimeter-wave spectroscopy of stable molecules of astrophysical interest

R.Bocquet, J.M.Colmont, J.Cosleou, J.Demaison, G.Wlodarczak

Extreme UV absorption spectroscopy of the Rydberg states of CO isotopomers in pulsed supersonic free jet expansions

K.P.Huber, M.Eidelsberg, F.Launay, F.Rostas

Optical properties of amorphous aluminium oxide grains

B.Begemann, J.Dorschner, Th.Henning, H.Mutschke

Radiative Properties of the TiO Molecule

I.M.Hedgecock, Ch.Naulin, M.Costes

REMPI studies of the predissociated high Rydberg states of acetylene

J.H.Fillion, A.Campos, N.Shafizadeh, D.Gauyacq

Gas phase formation, dissociation and reactivity of organometallic complexes in an ion trap

P.Marty, A.Klotz, P.de Parseval, B.Chaudret, G.Serra, P.Boissel

The 21 micron emission line in protoplanetary nebulae: evidence for organometallic compounds?

C.Joblin, L.d'Hendecourt

Experimental studies of reactions of neutral and ionized PAHs

S.Laube, D.Pasquerault, A.Canosa, C.Rebrion, A.Le Padellec, J.C.Gomet, D.Parent

Photofragmentation of isolated PAH cations: direct determination of the oscillator strengths

P.de Parseval, P.Marty, P.Boissel

A search for Diffuse Interstellar Bands in the spectra of matrix isolated large PAH cations

D.Rolland, E.Dartois, L.d'Hendecourt

THEORY

Molecular dynamics simulation of H$_2$ formation at a graphite surface

P.Parneix, Ph.Br\'echignac

Relative stabilities of carbon oxides C$_n$O and C$_n$O$_2$ in Huckel theory

M.Leleyter

Further predictions from a close coupling model of Rydberg-valence interactions in the CO molecule

L.Tchang-Brillet, P.S.Julienne

Ab initio study of the three lowest triplet potential energy surfaces for the reaction N(^4S_u) + CH(X^2 PI_r) -> CN(X^2 SIGMA^+,A^2 PI_i) + H(^2S_g)

M.T.Rayez, Ph.Halvick, J.C.Rayez, R.Th\"urw\"achter

Potential energy functions and nuclear dynamics in C_2H_2^+

G.Chambaud, P.Rosmus, R.Van der Boom, S.Carter, N.C.Handy

Sulphur carbide clusters in circumstellar environment

G.Pascoli, K.Gadre

Theoretical study of small cationic silicon carbide clusters

G.Pascoli, D.Boureau, H.Lavendy, J.M.Robbe, J.P.Flament

Optoelectronic properties of a graphitic carbon cluster containing impurities

G.Pascoli, J.Leclercq

Electronic Structure of Si_2C Excited States

A.Spielfiedel, N.Feautrier, G.Chambaud, P.Rosmus

Ionization efficiencies of polycyclic aromatic hydrocarbons

H.W.Jochims, H.Baumg\"artel, S.Leach

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MODELS

Early Universe Chemistry: A theoretical study of the LiH and BeH formation through radiative association

D.Talbi, M.C.Bacchus-Montabonel

Formation and evolution of interstellar dust in the Galactic disk and the Magellanic Clouds

B.van den Hoek, T.de Jong

Dust formation around evolved stars

B.van den Hoek

The role of chemical data in interstellar models

J.Le Bourlot, G.Pineau des For\^ets, E.Roueff, D.R.Flower

Primordial molecules and cosmic background radiation

Signore, de Bernardis, Encrenaz, Maoli, Masi, Melchiorri B., Melchiorri F., D.Puy

Coal model for the IR emission spectra of proto-planetary nebulae

O.Guillois, I.Nenner, R.Papoular, C.Reynaud

Chemical evolutionary tracks of small Bok globules

C.Cecchi Pestellini, F.Scappini

MAPDISK : a tool to simulate the millimetric emission of protostellar disks and envelopes

D.Despois, S. Blinder

OBSERVATIONS

Interstellar polarization and properties of dust grains

W.B.Somerville

Cyanopolyyne molecules in circumstellar envelopes

Truong-Bach, Nguyen-Q-Rieu, D.Graham, A.Wootten

The excitation of H_2 in HH 1 and in HH 11

R.Gredel

The ionization fraction in dense clouds

C.de Boisanger, F.Helmich, E.van Dieshoeck

CN as atomic carbon indicator

B.T.Murphy, A.G.Gibb, L.T.Little

The small scale structure of the dust inside molecular clouds

S.Thoraval, P.Boiss\'e, G.Duvert

Dense clumps in the L1630 molecular cloud: structure, properties and kinematics

A.G.Gibb, L.T.Little, B.D.Heaton, K.K.Lehtinen

Isotopomeric carbon monoxide and multi-wavelength dust continuum observations of L379 IRS1

M.L.Kelly, G.H.Macdonald

Rotational excitation of O_2 in interstellar clouds: Preparation of PRONAOS-SMH experience

P.Marechal, Y.P.Viala, L.Pagani, P.Encrenaz

A proposed test with ISO of the presence of C_60^+ in the interstellar medium

C.Moutou, A.L\'eger, L.d'Hendecourt, J.Maier

A search for solid CO_2 absorption feature in IRAS-LRS spectra of protostars embedded in molecular clouds

L.d'Hendecourt, M.Jourdain de Muizon

Molecular lines towards the Horsehead Nebula

M.Kopp, E.Roueff, M.G\'erin, J.Le Bourlot, G.Pineau des For\^ets

What are the relationships between the gas content and composition of spiral galaxies and their star formation activity ; formation of the CII(158\,micron) line

S.Sauty, F.Casoli et al.

The structure of NGC 1333 from ^{13}CO and C^{18}O observations

A.Castets, S.Warin, W.D.Langer

H_2O masers in M82 : another tracer of star formation} {A.Baudry, N. Brouillet

Photodissociation and rotational excitation of interstellar CO

S.Warin, J.J.Benayoun, Y.P.Viala

Structure and clumpiness of circumstellar shells from optical long-slit spectroscopy in the KI resonance line

N.Mauron

New features of Extended Red Emission in Reflection Nebulae

D.Rouan, P.Lecoupanec, A.L\'eger