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Q-Chem, Inc. brings commercial, academic and government scientists worldwide in pharmaceuticals, materials science, biochemistry and other fields a comprehensive ab initio quantum chemistry program to solve computational problems faster, more accurately and less expensively than they could otherwise. Q-Chem also provides users with the highest level of technical support possible. The company was established in 1993.

Thousands of Q-Chem copies are being used around the world. About 55,000 licensed copies of Q-Chem have been sold up to date through Spartan alone. The citations of the two Q-Chem papers reached 300 per year in 2014, and is growing (as reported by ISI Web of Science). As part of the IBM World Community Grid, about 350,000 Q-Chem calculations are performed every day by the Harvard Clean Energy Project , which is powered by Q-Chem, free of charge.

Related Publications 

Advances in molecular quantum chemistry contained in the Q-Chem 4 program package
Y Shao, Z Gan, E Epifanovsky, ATB Gilbert, M Wormit, J Kussmann, AW Lange, A Behn, J Deng, X Feng, D Ghosh, M Goldey, PR Horn, LD Jacobson, I Kaliman, RZ Khaliullin, T Kus̈, A Landau, J Liu, EI Proynov, YM Rhee, RM Richard, MA Rohrdanz, RP Steele, EJ Sundstrom, HL Woodcock, PM Zimmerman, D Zuev, B Albrecht, E Alguire, B Austin, GJO Beran, YA Bernard, E Berquist, K Brandhorst, KB Bravaya, ST Brown, D Casanova, CM Chang, Y Chen, SH Chien, KD Closser, DL Crittenden, M Diedenhofen, RA Distasio, H Do, AD Dutoi, RG Edgar, S Fatehi, L Fusti-Molnar, A Ghysels, A Golubeva-Zadorozhnaya, J Gomes, MWD Hanson-Heine, PHP Harbach, AW Hauser, EG Hohenstein, ZC Holden, TC Jagau, H Ji, B Kaduk, K Khistyaev, J Kim, J Kim, RA King, P Klunzinger, D Kosenkov, T Kowalczyk, CM Krauter, KU Lao, AD Laurent, KV Lawler, SV Levchenko, CY Lin, F Liu, E Livshits, RC Lochan, A Luenser, P Manohar, SF Manzer, SP Mao, N Mardirossian, AV Marenich, SA Maurer, NJ Mayhall, E Neuscamman, CM Oana, R Olivares-Amaya, DP Oneill, JA Parkhill, TM Perrine, R Peverati, A Prociuk, DR Rehn, E Rosta, NJ Russ, SM Sharada, S Sharma, DW Small, A Sodt – Molecular Physics (2014) 113, 184