skip to content

Professor Stuart Althorpe

Portrait of sca10

Our research investigates how the quantum properties of atomic nuclei affect chemical reaction rates and mechanisms. We develop and apply a wide range of theories and computational techniques, from exact solutions of the Schrödinger equation for small systems, to approximate Feynman path- integral approaches for larger systems.

First-principles calculations of wave functions of chemical reactions

We were the first group to calculate a complete time-dependent wave function that visualizes the entire dynamics of a chemical reaction from approach of the reactants through to scattering of the products into space. This work is done in collaboration with a leading experimental group (R.N. Zare, Stanford) who measure detailed product-scattering patterns that our calculations reproduce and interpret in terms of first-principles quantum mechanics.

Instanton simulations of quantum tunnelling

Instantons arise when Feynman path-integral theory is used to describe quantum tunnelling through barriers; they describe the dominant tunnelling path, which gives an approximate but physically rigorous description of the tunnelling dynamics. We have recently developed and extended instanton theory such that the instantons are represented by a series of beads which can be rapidly strung together to describe quantum tunnelling in complex systems. We are currently applying this method to tunnelling in water clusters (in collaboration with Prof. D.J. Wales), and to proton transfer reactions in solution.

Winding effects at conical intersections

Conical intersections arise when potential energy surfaces intersect. We have found that the nuclear wave functions at such intersections can be unwound, such that contributions from Feynman paths that wind different numbers of times around the intersection can be rigorously separated. This gives rise to quantum interference effects; we are currently investigating how such effects influence the efficiency of relaxation through a conical intersection.


Fundamentals: general discussion.
SC Althorpe, V Beniwal, PG Bolhuis, J Brandão, DC Clary, J Ellis, W Fang, DR Glowacki, TJH Hele, H Jónsson, J Kästner, N Makri, DE Manolopoulos, LK McKemmish, G Menzl, TF Miller Iii, WH Miller, E Pollak, S Rampino, JO Richardson, M Richter, P Roy Chowdhury, D Shalashilin, J Tennyson, R Welsch
– Faraday Discussions
Non-adiabatic reactions: General discussion
SC Althorpe, N Ananth, G Angulo, RD Astumian, V Beniwal, J Blumberger, PG Bolhuis, B Ensing, DR Glowacki, S Habershon, S Hammes-Schiffer, TJH Hele, N Makri, DE Manolopoulos, LK McKemmish, TF Miller Iii, WH Miller, AJ Mulholland, T Nekipelova, E Pollak, JO Richardson, M Richter, P Roy Chowdhury, D Shalashilin, R Szabla
– Faraday Discussions
Non-equilibrium dynamics from RPMD and CMD.
R Welsch, K Song, Q Shi, SC Althorpe, TF Miller
– The Journal of chemical physics
Quantum Tunneling Rates of Gas-Phase Reactions from On-the-Fly Instanton Calculations.
AN Beyer, JO Richardson, PJ Knowles, J Rommel, SC Althorpe
– Journal of Physical Chemistry Letters
Rovibrational transitions of the methane-water dimer from intermolecular quantum dynamical computations
J Sarka, AG Császár, SC Althorpe, DJ Wales, E Mátyus
– Physical chemistry chemical physics : PCCP
Quantum tunneling splittings from path-integral molecular dynamics.
E Mátyus, DJ Wales, SC Althorpe
– The Journal of chemical physics
Calculating splittings between energy levels of different symmetry using path-integral methods
E Mátyus, SC Althorpe
– The Journal of chemical physics
Concerted hydrogen-bond breaking by quantum tunneling in the water hexamer prism.
JO Richardson, C Pérez, S Lobsiger, AA Reid, B Temelso, GC Shields, Z Kisiel, DJ Wales, BH Pate, SC Althorpe
– Science
Locating Instantons in Calculations of Tunneling Splittings: The Test Case of Malonaldehyde.
MT Cvitaš, SC Althorpe
– Journal of Chemical Theory and Computation
Differential Cross Sections for the H + D<inf>2</inf> → HD(v′ = 3, j′ = 4-10) + D Reaction above the Conical Intersection
H Gao, M Sneha, F Bouakline, SC Althorpe, RN Zare
– The journal of physical chemistry. A
  • 1 of 10
  • >

Research Group

Research Interest Group

Telephone number

01223 336373

Email address