The LAM of the rings: Large amplitude motions in aromatic molecules studied by microwave spectroscopy

HVL Nguyen, W Caminati, JU Grabow - Molecules, 2022 - mdpi.com
Large amplitude motions (LAMs) form a fundamental phenomenon that demands the
development of specific theoretical and Hamiltonian models. In recent years, along with the …

Large amplitude motions in 2, 3-Dimethylfluorobenzene: steric effects failing to interpret hindered methyl torsion

S Khemissi, A Pérez Salvador… - The Journal of Physical …, 2021 - ACS Publications
The microwave spectrum of 2, 3-dimethylfluorobezene, one of the six isomers of
dimethylfluorobenzene, was recorded using a pulsed molecular jet Fourier transform …

Coupled large amplitude motions: the effects of two methyl internal rotations and 14N quadrupole coupling in 4, 5-dimethylthiazole investigated by microwave …

V Van, T Nguyen, W Stahl, HVL Nguyen… - Journal of Molecular …, 2020 - Elsevier
The molecular jet Fourier-transform microwave spectrum of 4, 5-dimethylthiazole has been
recorded between 2.0 and 26.5 GHz, revealing torsional splittings arising from two …

Two methyl internal rotations of 2-acetyl-4-methylthiophene explored by microwave spectroscopy and quantum chemistry

C Dindić, M Barth, HVL Nguyen - … Acta Part A: Molecular and Biomolecular …, 2022 - Elsevier
The microwave spectrum of 2-acetyl-4-methylthiophene (2A4MT) was recorded in the
frequency range from 2 to 26.5 GHz using a molecular jet Fourier transform microwave …

The scent of Maibowle–π electron localization in coumarin from its microwave‐determined structure

HVL Nguyen, JU Grabow - ChemPhysChem, 2020 - Wiley Online Library
The microwave spectra of the natural substance coumarin, a planar aromatic molecule with
the specific scent of maibowle, a popular fruit punch served in spring and early summer …

Microwave Spectrum of Two‐Top Molecule: 2‐Acetyl‐3‐Methylthiophene

C Dindić, HVL Nguyen - ChemPhysChem, 2021 - Wiley Online Library
The microwave spectrum of 2‐acetyl‐3‐methylthiophene (2A3MT) was recorded in the
frequency range from 2 to 26.5 GHz using a molecular jet Fourier transform microwave …

Rotational spectroscopy of the atmospheric photo-oxidation product o-toluic acid and its monohydrate

EG Schnitzler, BLM Zenchyzen, W Jäger - … Chemistry Chemical Physics, 2016 - pubs.rsc.org
o-Toluic acid, a photo-oxidation product in the atmosphere, and its monohydrate were
characterized in the gas phase by pure rotational spectroscopy. High-resolution spectra …

Evaluating the Effect of Photoaging on Polyethylene Permeability: Measurement of the Transport Properties in the Liquid Phase

Z Chen, J Christmann, M Sarakha - ACS Applied Polymer …, 2023 - ACS Publications
The consequences of polyethylene photooxidation on the transmission rate of various
permeants in methanolic solution were investigated using a self-designed setup with in-live …

Contrasting effects of water on the barriers to decarboxylation of two oxalic acid monohydrates: a combined rotational spectroscopic and ab initio study

EG Schnitzler, C Badran, W Jäger - The Journal of Physical …, 2016 - ACS Publications
Using rotational spectroscopy, we have observed two isomers of the monohydrate of oxalic
acid, the most abundant dicarboxylic acid in the atmosphere. In the lowest-energy isomer …

Determination of rotational constants in the presence of methyl internal rotation: 2-acetylfuran and 2-acetylthiophene as examples

J Demaison, N Vogt, HVL Nguyen - Chemical Physics Letters, 2022 - Elsevier
A simple method to determine unperturbed rotational constants in the presence of internal
rotation is proposed and applied on the microwave data sets of 2-acetylfuran and 2 …