Acetylene

acetylene

name acetylene
formula C2H2
CAS number 74-86-2

Dielectric screening

Eigenvalues of the symmetrized irreducible polarizability for acetylene, C2H2, computed in WEST by iterative diagonalization, using the PBE functional.

acetylene

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Spectral function

The G0W0 HOMO spectral function of acetylene, C2H2, computed in WEST with full frequency integration, using the PBE functional.

acetylene

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Vertical ionization potential (G0W0@PBE)

software basis set extrapolation core electrons self-energy QP eq. solver VIP [eV] ref.
BerkeleyGW PW no PSP FF-RA Full 10.97 [1]
FHI-aims LO yes AE AC Full 11.09 [1]
VASP PW yes PSP AC Linear 11.24 [2]
VASP PW yes PSP AC Full 11.07 [2]
WEST PW yes PSP FF-CD Linear 11.185 [3]
WEST PW yes PSP FF-CD Full 11.092 [3]
EXP 11.49 [4]

Vertical electron affinity (G0W0@PBE)

software basis set extrapolation core electrons self-energy QP eq. solver VEA [eV] ref.
WEST PW yes PSP FF-CD Linear -2.521 [3]
WEST PW yes PSP FF-CD Full -2.495 [3]

Legend

  • AE: All electron
  • AC: Analytic continuation
  • EXP: Experimental value, if marked in parentheses the ionization potential is not vertical
  • FF-CD: Full frequency integration with contour deformation
  • FF-RA: Full frequency integration along the real axis
  • Full: Full solution of the quasiparticle (QP) equation
  • Linear: Solution of the linearized quasiparticle (QP) equation
  • LO: Localized orbitals
  • PSP: Pseudopotential
  • PW: Plane waves

References

  1. GW100: Benchmarking G0W0 for Molecular Systems, M.J. van Setten et al., J. Chem. Theory Comput. 11, 5665 (2015).
  2. GW100: A Plane Wave Perspective for Small Molecules, E. Maggio et al., J. Chem. Theory Comput. 13, 635 (2017).
  3. GW100: Comparison of Methods and Accuracy of Results Obtained with the WEST Code, M. Govoni, and G. Galli, J. Chem. Theory Comput. 18, 1895 (2018).
  4. P.J. Linstrom and W.G. Mallard, Eds., NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg MD, 20899.