Publications

Found 90 results
1999
Nightingale MP, Umrigar CJ.  1999.  Monte Carlo eigenvalue methods in quantum mechanics and statistical mechanics. MONTE CARLO METHODS IN CHEMICAL PHYSICS. 105:65-115.
Umrigar CJ.  1999.  Variational Monte Carlo basics and applications to atoms and molecules. QUANTUM MONTE CARLO METHODS IN PHYSICS AND CHEMISTRY. 525:129-160.
1998
Umrigar CJ, Savin A, Gonze X.  1998.  Are unoccupied Kohn-Sham eigenvalues related to excitation energies? ELECTRONIC DENSITY FUNCTIONAL THEORY: RECENT PROGRESS AND NEW DIRECTIONS. :167-176.
Al-Sharif AI, Resta R, Umrigar CJ.  1998.  Evidence of physical reality in the Kohn-Sham potential: The case of atomic Ne. Phys. Rev. A. 57:2466-2469.
Goedecker S, Umrigar CJ.  1998.  Natural orbital functional for the many-electron problem. Phys. Rev. Lett.. 81:866-869.
Savin A, Umrigar CJ, Gonze X.  1998.  Relationship of Kohn-Sham eigenvalues to excitation energies. CHEMICAL PHYSICS Lett.. 288:391-395.
Huang CJ, Filippi C, Umrigar CJ.  1998.  Spin contamination in quantum Monte Carlo wave functions. J. Chem. Phys.. 108:8838-8847.
1997
Huang CJ, Umrigar CJ, Nightingale MP.  1997.  Accuracy of electronic wave functions in quantum Monte Carlo: The effect of high-order correlations. J. Chem. Phys.. 107:3007-3013.
Goedecker S, Umrigar CJ.  1997.  Critical assessment of the self-interaction-corrected local-density-functional method and its algorithmic implementation. Phys. Rev. A. 55:1765-1771.
Filippi C, Umrigar CJ, Gonze X.  1997.  Excitation energies from density functional perturbation theory. J. Chem. Phys.. 107:9994-10002.
Huang CJ, Umrigar CJ.  1997.  Local correlation energies of two-electron atoms and model systems. Phys. Rev. A. 56:290-296.
Umrigar CJ.  1997.  Prospects for improved density functionals. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY. 213:122-COMP.
1996
Filippi XGonze Clau, Umrigar C.J.  1996.  Generalized gradient approximations to density functional theory: Comparion with exact results. Recent Developments and Applications of Density Functional Theory.
Filippi C, Umrigar CJ.  1996.  Multiconfiguration wave functions for quantum Monte Carlo calculations of first-row diatomic molecules. J. Chem. Phys.. 105:213-226.
Filippi C, Umrigar CJ, Gonze X.  1996.  Separation of the exchange-correlation potential into exchange plus correlation: An optimized effective potential approach. Phys. Rev. A. 54:4810-4814.
1995
KHEIN A, SINGH DJ, Umrigar CJ.  1995.  ALL-ELECTRON STUDY OF GRADIENT CORRECTIONS TO THE LOCAL-DENSITY FUNCTIONAL IN METALLIC SYSTEMS. Phys. Rev. B. 51:4105-4109.
CIOSLOWSKI J, STEFANOV BB, TAN A, Umrigar CJ.  1995.  ELECTRON INTRACULE DENSITIES WITH CORRECT ELECTRON COALESCENCE CUSPS FROM HILLER-SUCHER-FEINBERG-TYPE IDENTITIES. J. Chem. Phys.. 103:6093-6103.
1994
Umrigar CJ, Gonze X.  1994.  ACCURATE EXCHANGE-CORRELATION POTENTIALS AND TOTAL-ENERGY COMPONENTS FOR THE HELIUM ISOELECTRONIC SERIES. Phys. Rev. A. 50:3827-3837.
Filippi C, SINGH DJ, Umrigar CJ.  1994.  ALL-ELECTRON LOCAL-DENSITY AND GENERALIZED-GRADIENT CALCULATIONS OF THE STRUCTURAL-PROPERTIES OF SEMICONDUCTORS. Phys. Rev. B. 50:14947-14951.
Filippi C, Umrigar CJ, TAUT M.  1994.  COMPARISON OF EXACT AND APPROXIMATE DENSITY FUNCTIONALS FOR AN EXACTLY SOLUBLE MODEL. J. Chem. Phys.. 100:1290-1296.
1993
Umrigar CJ.  1993.  ACCELERATED METROPOLIS METHOD. Phys. Rev. Lett.. 71:408-411.
Umrigar CJ, Nightingale MP, RUNGE KJ.  1993.  A DIFFUSION MONTE-CARLO ALGORITHM WITH VERY SMALL TIME-STEP ERRORS. J. Chem. Phys.. 99:2865-2890.
1992
BALLONE P, Umrigar CJ, DELALY P.  1992.  ENERGIES, DENSITIES, AND PAIR CORRELATION-FUNCTIONS OF JELLIUM SPHERES BY THE VARIATIONAL MONTE-CARLO METHOD. Phys. Rev. B. 45:6293-6296.
1991
MYERS CR, Umrigar CJ, SETHNA JP, MORGAN JD.  1991.  FOCKS EXPANSION, KATOS CUSP CONDITIONS, AND THE EXPONENTIAL ANSATZ. Phys. Rev. A. 44:5537-5546.
1988
Umrigar CJ, WILSON KG, WILKINS JW.  1988.  OPTIMIZED TRIAL WAVE-FUNCTIONS FOR QUANTUM MONTE-CARLO CALCULATIONS. Phys. Rev. Lett.. 60:1719-1722.
1986
PINDOR AJ, VOSKO SH, Umrigar CJ.  1986.  CALCULATED AGAINST EXPERIMENTAL CHARGE-DENSITY DISTRIBUTION OF BE METAL. JOURNAL OF PHYSICS F-METAL PHYSICS. 16:1207-1212.
KARIKORPI M, MANNINEN M, UMRIGAR C.  1986.  CALCULATION OF HELIUM DIFFRACTION FROM METAL-SURFACES. SURFACE SCIENCE. 169:299-316.
GUPTA R, WILSON KG, UMRIGAR C.  1986.  IMPROVED MONTE-CARLO RENORMALIZATION-GROUP METHOD. JOURNAL OF STATISTICAL PHYSICS. 43:1095-1099.
1985
UMRIGAR C, WILKINS JW.  1985.  ADSORPTION SITE, ADSORPTION ENERGY, AND NORMAL VIBRATION FREQUENCY OF H ON NI(100) VIA TOTAL-ENERGY CALCULATIONS. Phys. Rev. Lett.. 54:1551-1554.
BENESH GA, WOOLLEY AM, UMRIGAR C.  1985.  THE PRESSURE DEPENDENCES OF TIS2 AND TISE2 BAND STRUCTURES. JOURNAL OF PHYSICS C-SOLID STATE PHYSICS. 18:1595-1603.
1984
MANNINEN M, NORSKOV JK, PUSKA MJ, UMRIGAR C.  1984.  REPULSIVE INTERACTION OF THE HELIUM ATOM WITH A METAL-SURFACE. Phys. Rev. B. 29:2314-2316.
DOWBEN PA, HESKETT D, PLUMMER EW, SAKISAKA Y, RHODIN TN, UMRIGAR C.  1984.  SURFACE-WAVE-INDUCED INTERFERENCE EFFECTS IN ANGLE-RESOLVED PHOTOEMISSION. Phys. Rev. Lett.. 53:1493-1496.
1982
UMRIGAR C, ELLIS DE, WANG D, KRAKAUER H, POSTERNAK M.  1982.  BAND-STRUCTURE, INTERCALATION, AND INTERLAYER INTERACTIONS OF TRANSITION-METAL DICHALCOGENIDES - TIS2 AND LITIS2. PHYSICAL REVIEW B. 26:4935-4950.
MANNINEN M, NORSKOV JK, UMRIGAR C.  1982.  CALCULATION OF THE HELIUM DIFFRACTION FROM THE RECONSTRUCTED AU(110) SURFACE. SURFACE SCIENCE. 119:L393-L400.
MANNINEN M, NORSKOV JK, UMRIGAR C.  1982.  CALCULATION OF THE HELIUM DIFFRACTION FROM THE RECONSTRUCTED AU(110) SURFACE. SURFACE SCIENCE. 119:L393-L400.
MANNINEN M, NORSKOV JK, UMRIGAR C.  1982.  RARE-GAS-METAL PAIR POTENTIAL - HE-VACANCY INTERACTION. JOURNAL OF PHYSICS F-METAL PHYSICS. 12:L7-L11.
1980
UMRIGAR C, ELLIS DE.  1980.  EMBEDDED CLUSTER MODEL OF NBO2 - COMPTON PROFILE AND ELECTRONIC-SPECTRA. PHYSICAL REVIEW B. 21:852-861.
1977
BHATTACHARYA S, Umrigar CJ, KETTERSON JB.  1977.  ANISOTROPIC ULTRASOUND PROPAGATION IN A SMECTIC-C LIQUID-CRYSTAL. MOLECULAR CRYSTALS AND LIQUID CRYSTALS. 40:79-89.
0
Sharma S, Yanai T, Booth G, Umrigar C.J, Chan GKin-Lic.  0.  Spectroscopic accuracy directly from quantum chemistry: Application to ground and excited states of beryllium dimer. {J. Chem. Phys.}. {140}