The Nielsen Hamiltonian of the general polyatomic molecule including anharmonicity and its resonances, Coriolis-coupling and its resonances, and rotation-vibration interaction are treated by statistical perturbat ion theory in its operator form. By generating function methods and operator theorems, which are treated in an appendix, cumbersome calculations with non-commuting operators are avoide...

We experimentally demonstrate the dissociative photoionization of CHBrCl2 molecules in a femtosecond laser field by time-of-flight mass spectrum and dc-slice imaging technology. The results suggest that low kinetic energy components are from ionization process single-charged molecular ions. angular distribution fragment Cl+ ions can be attributed to features state configuration, Br+ electronic ...

The rovibrational partition functions of diatomic molecules are calculated using a classical framework plus quantum, semiclassical, and semiempirical corrections. The most popular methods to calculate such corrections are briefly reviewed and applied to the benchmark H2 molecule. A novel hybrid scheme is proposed and applied to H2, HCl, and ArO. Each method is analyzed with a view to find an ec...

The novel technique of femtosecond time-resolved photoelectron-photoion coincidence imaging is applied to unravel dissociative ionization processes in a polyatomic molecule. Femtosecond coincidence imaging of CF3I photodynamics illustrates how competing multiphoton dissociation pathways can be distinguished, which would be impossible using photoelectron or ion imaging alone. Ion-electron energy...

Recently a number of diatomic and polyatomics molecules has been identified as a prospective systems for Doppler cooling. Polyatomic molecules with heavy nuclei present great interest for search for new physics outside of Standard Model and a large variety of other applications including cold chemistry, quantum informatics etc. Herein we propose radium monohydroxide molecule (RaOH) which is on ...

Exposing a molecule to intense light pulses may bring this nonstationary quantum state, thus launching correlated dynamics of electronic and nuclear subsystems. Although much had been achieved in the understanding fundamental physics behind electron-nuclear interactions dynamics, accurate numerical simulations light-induced processes taking place polyatomic molecules remain formidable challenge...

Protonated molecular hydrogen, H(3)(+), is the simplest polyatomic molecule. It is the most abundantly produced interstellar molecule, next only to H(2), although its steady state concentration is low because of its extremely high chemical reactivity. H(3)(+) is a strong acid (proton donor) and initiates chains of ion-molecule reactions in interstellar space thus leading to formation of complex...

Visualizing molecular transformations in real-time requires a structural retrieval method with Ångström spatial and femtosecond temporal atomic resolution. Imaging of hydrogen-containing molecules additionally an imaging sensitive to the positions hydrogen nuclei, most methods possessing relatively low sensitivity scattering. Laser-induced electron diffraction (LIED) is table-top technique that...