Nicholas Charles Handy (17 June 1941 – 2 October 2012) was a British theoretical chemist. He retired as Professor of quantum chemistry at the University of Cambridge in September 2004.
Handy was born in Wiltshire, England and educated at Clayesmore School. He studied the Mathematical Tripos at the University of Cambridge and completed his PhD on theoretical chemistry supervised by Samuel Francis Boys.
Handy wrote 320 scientific papers published in physical and theoretical chemistry journals.
Handy developed several methods in quantum chemistry and theoretical spectroscopy. His contributions have helped greatly to the understanding of:
the long range behaviour of Hartree–Fock orbitals
semiclassical methods for vibrational energies
the variational method for rovibrational wave-functions (in normal mode and internal coordinates)
Full configuration interaction with Slater determinants (benchmark studies)
convergence of the Møller–Plesset series
Anharmonic spectroscopic and thermodynamic properties using higher derivative methods
Open shell Møller–Plesset theory
frequency-dependent properties
Density functional theory : quadrature, new functionals and molecular properties.
Handy was elected a Fellow of the Royal Society (FRS) in 1990. He was awarded the Leverhulme Medal in 2002 and was a member of the International Academy of Quantum Molecular Science.
On 2 October 2012 Nicholas died after a brief battle with pancreatic cancer.