We perform magnetically assisted Sisyphus laser cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in the rotationally closed P(N^{''}=1) branch of either the X[over ˜]^{2}Σ^{+}(000)↔A[over ˜]^{2}Π_{1/2}(000) or the X[over ˜]^{2}Σ^{+}(000)↔B[over ˜]^{2}Σ^{+}(000) vibronic transitions. Molecules lost into the excited vibrational ...

For a polyatomic molecule at zero total angular momentum, this paper shows that an internal motion with nonzero internal angular momentum within a (generalized) Eckart frame will produce a net rotation of the (generalized) Eckart frame in the center-of-mass frame. For a polyatomic molecule at nonzero total angular momentum, an internal motion within a generalized Eckart frame with nonzero orbit...

The vibrationally autoionizing Rydberg states of small polyatomic molecules provide a fascinating laboratory in which to study fundamental nonadiabatic processes. In this review, recent results on the vibrational mode dependence of vibrational autoionization are discussed. In general, autoionization rates depend strongly on the character of the normal mode driving the process and on the electro...

We report applications of the quantitative rescattering theory (QRS) for calculation of high-order-harmonic generation (HHG) from polyatomic molecules in ultrashort linearly polarized intense laser pulses, using the example of the CCl4 molecule. In particular, we present a detailed analysis and a treatment for the phase of the electron returning wave packet, which recollides with the parent mol...

The state-selective photodissociation of methylnitrite CH30NO(So,v) + hv -+ CH30+ NO(t,r,v) is reviewed and the dynamics of the bond-breaking process is analysed in connection with an ab initio S1-potential energy surface of the parent molecule. Experimental and theoretical results reveal an interesting picture of the dissociation path of a polyatomic molecule which decays by vibrational predis...

We study optical cycling in the polar free radical calcium monohydroxide (CaOH) and establish an experimental path towards scattering $\sim$$10^4$ photons. report rovibronic branching ratio measurements with precision at $\sim10^{-4}$ level observe weak symmetry-forbidden decays to bending modes non-zero vibrational angular momentum. Calculations are excellent agreement these predict additional...

Extremely high charge states of atoms and molecules can be created when they are irradiated by intense x-ray pulses. At certain photon energies, electron ejection from drastically enhanced transient resonances during the sequential ionization process. Here we report on observation such resonance effects in a molecule, CH3I, show photon-energy-dependent shift resonance-induced structures ion sta...

Ro-vibrational Stark-associated phenomena of small polyatomic molecules are modelled using extensive spectroscopic data generated as part of the ExoMol project. The external field Hamiltonian is built from the computed ro-vibrational line list of the molecule in question. The Hamiltonian we propose is general and suitable for any polar molecule in the presence of an electric field. By exploitin...