IGNOU MCH 11 2026 2027 - What are Racah parameters? What do they signify? The gas-phase i

Question

What are Racah parameters? What do they signify? The gas-phase ion V3+ has a 3F ground
term. The 1D and 3P terms lie, respectively, 10,642 and 12,920 cm-1 above it. The energies of
the terms are given in terms of Racah parameters as E(
3F) = A=8B, E(
3P)=A+7B, E(
1D) =
A-3B+2C. Calculate the values of B and C for V
3+

13 Aug 2026

Answer :

Word Count : 414

Racah parameters are quantitative measures used to describe the interelectronic repulsion in atoms and ions, particularly those containing partially filled d- or f-subshells. They are represented by the parameters A, B and C. These parameters arise from the electrostatic interactions between electrons and are useful in describing the energies of different electronic terms of a free ion. The Racah parameter A represents the average electrostatic energy of the electron configuration. Since A contributes approximately equally to all terms arising from the same electron

_________ __________ _______ ______ ________.
_________ _________ _________ ______ ____ _____ ______ ______ ________ _________ _______.
________ ___ ____ ________ ___ _____ _____ ______ ___ ________ _______.
_______ __________ ____ ________ _____ ________ ___ ______.
__________ _______ _____ ____ __________ __________ _________.
______ ___ ___ _______ __________ _____ _______ _____ ___ ___ ___ ___.
_______ __________ ____ __________ ______ ________ ___.
__________ ___ ___ ______ __________ _______ _____ _________ ______ _________.
________ ___ _____ _______ ________ __________ _________ _______.
____ ____ ________ _________ _______ _______ ______ ______ ___ __________ _______ _____.
_______ ___ ____ ________ ___ ___ ____ ____ ____ ______ ____ ______.
________ ________ _______ _________ _________ __________ _____ __________ _____ _________ __________.
_______ __________ ________ _____ ____ __________ ________ ________ ____ _________.
________ _________ _________ _______ ________ __________ ____ ____ ________ _______.
_____ ___ ____ ___ ____ ___ __________ ______ _____ _________ _______ ______.
_____ ___ ____ _____ ________ _________ __________.
_________ _______ __________ ___ ___ ___ ____ __________.
____ ___ ________ ____ _______.
_________ _________ ________ _____ _______.
__________ _______ _______ __________ ___ ________ ________ __________ __________ ______ _____.
___ _________ ______ __________ _________ _______ ________ ____ _____.
__________ _________ _____ ______ ____ ______ ________ ___ ___ _____ __________.
_________ _______ __________ _________ ____ ____.
____ ____ _____ ________ ________ _____ ______ _________ _____ ________.
___ _____ _________ _____ ___ _________ __________ __________.
___ _________ ___ ___ ________ __________ _____ _________ __________ ________.
_____ _________ ____ _______ _______ _______ __________ ________ _______ _________.
____ ___ ____ _______ _________ ______ _______ ______.
___ __________ ___ ___ ___ _______ _______ ___ _________ ____.
______ _______ ________ _______ _________ _____ __________ ____.
_________ ____ ________ ___ _____ _____ _________ __________ ______.
__________ _______ __________ ___ _______ ______ __________ _______ ___.
___ _________ ________ ___ _______ ____ ___ ___ ________ ______ _____.
______ _______ _______ ______ _______ ____.
________ _______ __________ ______ _________ ______ ___.
___ ________ ________ _________ ____ _______ _______ ________ __________ __________ _________.
____ ___ _______ _____ ______ _______.

IGNOU ACADEMY

Your IGNOU journey, made easier.

Solved Assignments
Study Notes
Guess Papers
Question Papers

Call Us WhatsApp

STUDY • PREPARE • SUCCEED

Skip in 10