Tribute to Krishnan Raghavachari

It is quite likely that at all times of the day and night, some number of CCSD(T) and Gaussian-n compound model chemistry calculations are running somewhere in the world. Even more probable is that there is always some computer somewhere running correlated electronic structure calculations with the polarized 6-311G basis set. It is also nearly certain that self-consistent field theory second-derivative calculations to calculate spectroscopic and thermodynamic properties are running on computers on our planet 24 h a day, 7 days a week.