English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

The BOUND program calculates the bound states of a complex formed from twointeracting particles using coupled-channel methods. It is particularlysuitable for the bound states of atom-molecule and molecule-molecule Van derWaals complexes and for the near-threshold bound states that are important inultracold physics. It uses a basis set for all degrees of freedom except $R$,the separation of the centres of mass of the two particles. The Schr\"odingerequation is expressed as a set of coupled equations in $R$. Solutions of thecoupled equations are propagated outwards from the classically forbidden regionat short range and inwards from the classically forbidden region at long range,and matched at a point in the central region. Built-in coupling cases includeatom + rigid linear molecule, atom + vibrating diatom, atom + rigid symmetrictop, atom + asymmetric or spherical top, rigid diatom + rigid diatom, and rigiddiatom + asymmetric top. Both programs provide an interface for plug-inroutines to specify coupling cases (Hamiltonians and basis sets) that are notbuilt in. With appropriate plug-in routines, BOUND can take account of theeffects of external electric, magnetic and electromagnetic fields, locatingbound-state energies at fixed values of the fields. The related program FIELDuses the same plug-in routines and locates values of the fields where boundstates exist at a specified energy. As a special case, it can locate values ofthe external field where bound states cross scattering thresholds and producezero-energy Feshbach resonances. Plug-in routines are supplied to handle thebound states of a pair of alkali-metal atoms with hyperfine structure in anapplied magnetic field.

BOUND and FIELD: programs for calculating bound states of interacting pairs of atoms and molecules