The Perturbation between the G1Π and 21Δ States of 7Li2

The Perturbation of the B1Π and C1Σ+ States in KLi

“…The and indices stand for all quantum numbers describing the B and the C states except v and v. Because the neighbouring states, considered in Eqs. [7] and [8], are quite remote from the energy levels of the B and C states taken into account in [6], the q (v 1 , v 2 ) and q (v 1 , v 2 ) coefficients are almost constant with only a very weak dependence on v and v. It is therefore possible to approximate them with a finite power series in v and v:…”

“…. stands for η el , {q pq }, and {q pq }) should minimize the difference between the experimental energy levels and those obtained by diagonalization of the Hamiltonian [6].…”

“…Since the eigenvalues E calc i of matrix [6] vary non-linearly with {α j }, an appropriate LSA technique is required (see, e.g., (24)). In such cases one usually starts from some trial values of the parameters {α 0 j } and then improves them iteratively.…”

“…diagonalization of the Hamiltonian matrix [6] with a trial set of parameters {α 0 } and determination of the transformation matrix T;…”