Complex scaling enables one to associate the resonance phenomenon, as it appears in
atomic, molecular, nuclear physics and in chemical reactions, with a single square …

Multichannel atomic spectra frequently exhibit such extraordinary visual complexity that they
appear at first glance to be uninterpretable. The present review discusses how to unravel …

A comprehensive survey of the quantum scattering methodology that results from applying
the S‐matrix version of the Kohn variational principle to the reactive scattering formulation …

The S‐matrix version of the Kohn variational principle is used to obtain a very effective
method for quantum scattering calculations. The approach is especially useful for the …

We present a formulation for low-energy positron-molecule collisions based on the
Schwinger multichannel method (SMC) which was previously adapted for electron-molecule …

An algebraic variational method, based on application of the Kohn principle to the T matrix,
is formulated for multichannel scattering problems and applied to the case of low-energy …

A technique for measuring photoionization time delays with attosecond precision is
combined with calculations of photoionization matrix elements to demonstrate how …

This book brings together the essential ideas and methods behind applications of variational
theory in theoretical physics and chemistry. The emphasis is on understanding physical and …

The complex Kohn variational method, which is an anomaly-free algebraic variational
procedure, is implemented for the case of collisions of electrons with polyatomic molecules …

Fully converged state-to-state integral cross sections are reported for the reaction H+ H 2 (ν
1= j 1= 0)→ H,(ν 2= 1, j 2= 1 and 3)+ H over a wide range of energy. The calculations …