2014 We show that the pressure broadening of the width 2 ~(4 V2 + (01270393)2) of an anticrossing signal (where V is the coupling between the anticrossing levels and 0393 the reciprocal of their lifetime) is caused by more than just the increase of 0393 by collisions. We find that the linewidth is given by 2 ~(4 V2 ab03B3/03B3 + (0127 ab03B3)2), where ab03B3/03B3 is the ratio of the effective r...

A relativistic CI treatment including spin-orbit coupling has been carded out for the low-lying electronic states of bismuth iodide, employing effective core potentials for both atoms. The X 3Xground state is computed to have a zero-field splitting of 5096 cm-1, 1086 cm-1 less than the most recent measured value. The a 1A state is predicted to have a T e value of 12336 cm -1, and it is suggeste...

A semi-quantitative method is presented for predicting the transition structure bond length and the kinetic energy released as a diatomic dication dissociates into monocation fragments. Our approach, which we term the ACDCP model, involves the introduction of diabatic coupling and polarization effects to an avoided-crossing model previously described. Good agreement is found between the predict...

We demonstrate a highly tunable deep notch filter realized in a liquid-crystal photonic-bandgap (LCPBG) fiber. The filter is realized without inducing a long-period grating in the fiber but simply by filling a solid-core photonic-crystal fiber with a liquid crystal and exploiting avoided crossings within the bandgap of the LCPBG fiber. The filter is demonstrated experimentally and investigated ...

We investigate a two-level model with a large number of open decay channels in order to describe avoided level crossing statistics in open chaotic billiards. This model allows us to describe the fundamental changes in the probability distribution of the avoided level crossings compared with the closed case. Explicit expressions are derived for systems with preserved and broken time-reversal sym...

We study a mechanism by which a symmetry-allowed conical intersection is converted to an avoided crossing by external breaking of symmetry. With full quantum dynamics on coupled ab initio potential energy surfaces for an NO(2) molecule under a phase controlled far-infrared femtosecond pulse field, we demonstrate that symmetry breaking thus-introduced can indeed convert the conical intersection ...