High-resolution UV spectroscopy of 1-indanol

• Published in: Physical chemistry chemical physics : PCCP Vol. 23; no. 12; pp. 748 - 756
• Main Authors: Hernandez-Castillo, A. O, Bischoff, Johannes, Lee, Ju Hyeon, Langenhan, Jennifer, Karra, Mallikarjun, Meijer, Gerard, Eibenberger-Arias, Sandra
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 28.03.2021
• Subjects: Dipole moments; Laser beams; Laser cooling; Laser induced fluorescence; Molecular beams; Narrowband; Neon; Pulsed lasers; Spectrum analysis
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/d0cp06170k

We report on rotationally resolved laser induced fluorescence (LIF) and vibrationally resolved resonance-enhanced multiphoton ionization (REMPI) spectroscopy of the chiral molecule 1-indanol. Spectra of the S 1 ← S 0 electronic transition are recorded in a jet-cooled, pulsed molecular beam. Using two time-delayed pulsed lasers, the lifetimes of the S 1 state of the two most stable conformers, referred to as eq1 and ax2, have been determined. The S 1 ← S 0 origin bands of these conformers as well as the transition to a vibrationally excited level in the S 1 state of eq1 are recorded with full rotational resolution (25 MHz observed linewidth) by measuring the LIF intensity following excitation with a tuneable, narrowband cw laser. On selected rotationally resolved electronic transitions, Lamb-dips are measured to confirm the Lorentzian lifetime-contribution to the observed lineshapes. The rotationally resolved S 1 ← S 0 origin band of a neon-complex of eq1 is measured via LIF as well. The fit of the rotationally resolved LIF spectra of the origin bands to those of an asymmetric rotor yields a standard deviation of about 6 MHz. The resulting spectroscopic parameters are tabulated and compared to the outcome of ab initio calculations. For both conformers as well as for the Ne-eq1 complex, the geometric structures in the S 0 and S 1 states are discussed. For all systems, the transition dipole moment is mainly along the a -axis, the contributions along the b - and c -axes being about one order of magnitude smaller. We report on rotationally resolved laser induced fluorescence (LIF) and vibrationally resolved resonance-enhanced multiphoton ionization (REMPI) spectroscopy of the chiral molecule 1-indanol.