Title :

Jet-cooled mid-infrared laser spectroscopy of centrosymmetric and n-bearings pahs

Author(s) :

Asselin, P [Auteur]
De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies [MONARIS]
Chawananon, Sathapana [Auteur]
Institut des Sciences Moléculaires d'Orsay [ISMO]
Pirali, Olivier [Auteur]
Institut des Sciences Moléculaires d'Orsay [ISMO]
Goubet, Manuel [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]

Conference title :

The 27th International Conference on High-Resolution Molecular Spectroscopy

Conference organizers(s) :

Université de Bologne, italie

City :

Bologna (ITALY)

Country :

Italie

Start date of the conference :

2024-09-01

English keyword(s) :

astrophysics PAH rovibrational spectroscopy supersonic jets
astrophysics
PAH
rovibrational spectroscopy
supersonic jets

HAL domain(s) :

Physique [physics]
Chimie

English abstract : [en]

The recent detection of cyano naphthalenes within TMC-1 using radioastronomy [1] provided the first unambiguous confirmation of the interstellar PAH's hypothesis and raised new questions concerning their formation and ...
Show more >The recent detection of cyano naphthalenes within TMC-1 using radioastronomy [1] provided the first unambiguous confirmation of the interstellar PAH's hypothesis and raised new questions concerning their formation and destruction pathways. In the mid-infrared (IR) domain, the launch of the James Webb Space Telescope opens exciting perspectives to collect rovibrational information about low volatile polycyclic aromatic compounds. In this context, rotationally resolved IR studies of large aromatic species are still very scarce and mainly used synchrotron-based Fourier Transform (FT) spectroscopy coupled to room temperature long path cells [2]. However, their spectral analysis remains very challenging due to the congested rotational structures and the presence of many hot bands. Nowadays, few set-ups combining high resolution (HR) IR spectroscopy to supersonic jets, using FT and cavity ring down spectroscopic methods were implemented to target PAH compounds [3]. Recently, a mid-IR laser spectrometer coupled to a pulsed jet (SPIRALES set-up at MONARIS) allows recording rovibrational spectra of large molecules at low temperature [4]. We report here the jet-cooled rovibrational IR study of centrosymmetric PAH molecules in both regions of ring C-H bending and C-C stretching vibrations to extract reliable spectroscopic parameters both in ground and excited vibrational states [5].HR measurements of N-bearing PAHs with up two N atoms substituted on the same ring evidenced abnormal Q-branch structures which make puzzling rovibrational analyses and suggests the presence of vibrational perturbations in spectral regions with high density of states.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL