Microwave Spectrum and Barrier to Internal Rotation of 4-Chlorophenol

Microwave spectrum of toluene - SO*: Structure, barrier to internal rotation, and dipole moment

The microwave spectrum of toluene * SO2 was observed with a pulsed beam Fouriertransform microwave spectrometer. The spectrum displays a-, b-, and c-dipole transitions. The transitions occur as doublets arising from the internal rotation of the methyl group. The transitions were assigned using the principal-axis method (PAM) internal rotation Hamiltonian with centrifugal distortions. Assuming a...

Structure and barrier to internal rotation of 4-methylstyrene in the S0- and S1-state

The rotationally resolved spectrum of the electronic origin of methylstyrene has been studied in order to obtain the geometric structure and the barriers to methyl torsion in the electronic ground and excited state. The spectrum has been analyzed using an automated assignment based on the Genetic Algorithm. The geometry is found to be quinoidally distorted upon electronic excitation, what is ty...

Structure of 4-fluorophenol and barrier to internal –OH rotation in the S1-state

The structure and barrier to internal rotation of 4-fluorophenol in the ground state and the electronically excited S1-state has been examined by resonantly enhanced two photon ionization spectroscopy and by rotationally resolved laser induced fluorescence spectroscopy of 4-fluorophenol and 4-fluorophenol-d1 . The rotationally resolved spectrum of the electronic origin of 4-fluorophenol is comp...

The Microwave Spectra of m-Xylene and m-Xylene-d10. Determination of the Low Methyl Internal Rotation Barrier

The rotational spectra of m-xylene, (CH3)2C6H4, and of m-xylene-d10, (CD3)2C6D4, have been recorded between 6 and 26.5 GHz using pulsed beam Fourier transform microwave spectroscopy. The clue for the assignment of the internal rotation multiplets was the inertial defect derived from the A1A1 species transitions. The rotational constants for m-xylene and m-xylene-d10 are A = 3572.1117(1) MHz / 2...

Probing the barrier for internal rotation of the retinal chromophore.