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All known vibration-rotation absorption lines of 13CH12CH accessing levels up to 6750 cm-1 were gathered from the literature. They were fitted simultaneously to J-dependent Hamiltonian matrices exploiting the well known vibrational polyad or cluster block diagonalization, in terms of the pseudo-quantum-numbers Ns=v1+v2+v3 and Nr=5v1+3v2+5v3+v4+v5, and accounting also for l parity and e/f symmetry properties. The anharmonic interaction coupling terms known to occur from a pure vibrational fit in this acetylene isotopologue [Robert et al., J. Chem. Phys. 123, 174302 (2005)] were included in the model. A total of 12 703 transitions accessing 158 different (v1v2v3v4v5,l4l5) vibrational states was fitted with a dimensionless standard deviation of 0.99, leading to the determination of 216 vibration-rotation parameters. The experimental data included very weak vibration-rotation transitions accessing 18 previously unreported states, some of them forming Q branches with very irregular patterns. [ABSTRACT FROM AUTHOR]

All known vibration-rotation absorption lines of 13CH12CH accessing levels up to 6750 cm-1 were gathered from the literature. They were fitted simultaneously to J-dependent Hamiltonian matrices exploiting the well known vibrational polyad or cluster block diagonalization, in terms of the pseudo-quantum-numbers Ns=v1+v2+v3 and Nr=5v1+3v2+5v3+v4+v5, and accounting also for l parity and e/f symmetry properties. The anharmonic interaction coupling terms known to occur from a pure vibrational fit in this acetylene isotopologue [Robert et al., J. Chem. Phys. 123, 174302 (2005)] were included in the model. A total of 12 703 transitions accessing 158 different (v1v2v3v4v5,l4l5) vibrational states was fitted with a dimensionless standard deviation of 0.99, leading to the determination of 216 vibration-rotation parameters. The experimental data included very weak vibration-rotation transitions accessing 18 previously unreported states, some of them forming Q branches with very irregular patterns. [ABSTRACT FROM AUTHOR]

We consider the small-Weber-number quasisteady deformation of a bubble moving in an inviscid liquid undergoing an inhomogeneous background flow. The use of polyadic spherical harmonics [Brenner, Chem. Eng. Sci. 19, 631 (1964)] allows for the treatment of general (nonaxisymmetric) irrotational flows. We correct the (overestimated) volumetric expansion value appearing in the literature, which resulted from an oversight in the application of Bernoulli’s equation. [ABSTRACT FROM AUTHOR]

Band strengths of the Fermi resonance polyads involving C-H stretching and bending vibrations for the CHBr[sub 3] molecule are calculated with a one-dimensional dipole function and a two-dimensional dipole surface. These are obtained by the ab initio density functional method. Both treatments reproduce the interpolyad band strengths quite well, while the two-dimensional dipole moment surface is superior to the one-dimensional one in modeling the intrapolyad band strength pattern, indicating the importance of the bending vibrations in dipole moment surface and intensities calculations. The different behavior of interpolyad band strengths of CHBr[sub 3] compared to CHCl[sub 3], with an intensity anomaly occurring in the latter case, is illustrated by "dipole-weighted" overlap integrals. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]