ADAS Subroutine r8qp
FUNCTION R8QP ( N , L ) C C C----------------------------------------------------------------------- C C **************** FORTRAN77 REAL*8 FUNCTION: R8QP ****************** C C PURPOSE: EXPECTATION VALUE <1/R^6> IN HYDROGEN APPROXIMATION FOR USE c IN QUADRUPOLE POLARISABILITY ENERGY SHIFT EVALUATION C C CALLING PROGRAM: CXLTHE, CXSODE C C C CALLING PROGRAM: GENERAL USE C C FUNC: (R*8) R8QP = EXPECTATION VALUE <1/R^6> C C INPUT: (I*4) N = PRINCIPAL QUANTUM NUMBER. C INPUT: (I*4) L = ORBITAL QUANTUM NUMBER. C C (R*8) XN = REAL VALUE = N. C (R*8) XL = REAL VALUE = L. C C ROUTINES: NONE C C AUTHOR: JONATHAN NASH (TESSELLA SUPPORT SERVICES PLC) C K1/0/81 C JET EXT. 5183 C C DATE: 02/11/93 C C VERSION: 1.1 DATE: 02-11-93 C MODIFIED: JONATHAN NASH C - FIRST RELEASE C C VERSION: 1.2 DATE: 17-04-07 C MODIFIED: HUGH SUMMERS C - FIRST FULLY COMMENTED RELEASE C C----------------------------------------------------------------------- C C----------------------------------------------------------------------- INTEGER L, N