Abstract
Various kinetic balances for constructing appropriate basis sets in four-component relativistic calculations are examined in great detail. These include the well-known restricted (RKB) and unrestricted (UKB) kinetic balances, the less-known dual kinetic balance (DKB) as well as the unknown inverse kinetic balance (IKB). The RKB and IKB are complementary to each other: The former is good for positive-energy states, whereas the latter good for negative-energy states. The DKB combines the good of both RKB and IKB and even provides full variational safety. However, such an advantage is largely offset by its complicated nature. The UKB does not offer any particular advantages as well. Overall, the RKB is the simplest ansatz. Although the negative-energy states by a finite RKB basis are in error of O(c 0), there is no objection to using them as intermediates for a sum-over-states formulation of perturbation theory, provided that the magnetic balance is also incorporated in the case of magnetic properties. In particular, the RKB is also an essential ingredient for formulating two-component relativistic theories, while all the others are simply incompatible. As such, the RKB should be regarded as the cornerstone of relativistic electronic structure calculations.
Similar content being viewed by others
References
Kim YK (1967) Phys Rev 154:17
Schwarz WHE, Wallmeier H (1982) Mol Phys 46:1045
Schwarz WHE, Wechsel-Trakowski E (1982) Chem Phys Lett 85:94
Kutzelnigg W (1984) Int J Quantum Chem 25:107
Wallmeier H (1984) Phys Rev A 29:2933
Talman JD (1986) Phys Rev Lett 57:1091
Hill RN, Krauthauser C (1994) Phys Rev Lett 72:2151
Stanton RE, Havriliak S (1984) J Chem Phys 81:1910
Dyall KG, Fægri K Jr (1990) Chem Phys Lett 174:25 (The acronyms RKB and UKB were proposed therein for the first time)
Ishikawa Y, Binning RC Jr, Sando KM (1983) Chem Phys Lett 101:111
Heully JL, Lindgren I, Lindroth E, Lundquist S, Mårtensen-Pendrill AM (1986) J Phys B 19:2799
Kutzelnigg W (1996) Phys Rev A 54:1183
Kutzelnigg W (1997) Chem Phys 225:203
Kutzelnigg W (1999) J Chem Phys 110:8283
Kutzelnigg W (1989) Z Phys D 11:15
Kutzelnigg W (2007) J Chem Phys 126:201103
Kutzelnigg W (1994) Int J Quantum Chem 51:447
Klahn BK, Bingel WA (1977) Theor Chim Acta 44:27
Kutzelnigg W, Liu W (2006) Mol Phys 104:2225
Kutzelnigg W, Liu W (2005) J Chem Phys 123:241102
Dyall KG (1997) J Chem Phys 106:9618
Dyall KG (2001) J Chem Phys 115:9136
Dyall KG (2002) J Comput Chem 23:786
Liu W, Peng D (2006) J Chem Phys 125:044102; 125:149901(E)
Peng D, Liu W, Xiao Y, Cheng L (2007) J Chem Phys 127:104106
Liu W, Kutzelnigg W (2007) J Chem Phys 126:114107
Kutzelnigg W, Liu W (2006) J Chem Phys 125:107102
Liu W (2007) Progr Chem 19:833
Liu W, Peng D (2009) J Chem Phys 131:031104
Iliaš M, Saue T (2007) J Chem Phys 126:064102
Sikkema J, Visscher L, Saue T, Iliaš M (2009) J Chem Phys 131:124116
Liu W (2010) Mol Phys 108:1679
Lee YS, Mclean AD (1982) J Chem Phys 76:735
Shabaev VM, Tupitsyn II, Yerokhin VA, Plunien G, Soff G (2004) Phys Rev Lett 93:130405
Dyall KG (1994) J Chem Phys 100:2118
Dyall KG, Grant IP, Wilson S (1984) J Phys B 17:483
Foldy LL, Wouthuysen SA (1950) Phys Rev 78:29
Dyall KG, Fægri K Jr (2007) Introduction to relativistic quantum chemistry. Oxford University Press, New York
Xiao Y, Peng D, Liu W (2007) J Chem Phys 126:081101
Liu W, Hong G, Li L, Xu G (1996) Chin Sci Bull 41:651
Hong W, Liu G, Dai D, Li L, Dolg M (1997) Theor Chem Acc 96:75
Liu W, Wang F, Li L (2003) J Theor Comput Chem 2:257
Liu W, Wang F, Li L (2004) Recent advances in relativistic molecular theory, recent advances in computational chemistry, vol 5. In: Hirao K, Ishikawa Y (eds). World Scientific, Singapore, p 257
Liu W, Wang F, Li L (2004) Encyclopedia of computational chemistry (electronic edition). In: von Ragué Schleyer P, Allinger NL, Clark T, Gasteiger J, Kollman PA, Schaefer HF III, Schreiner PR (eds) Wiley, Chichester
The interchanged eigenvectors should be \(({\bf -B}^D, {\bf A}^D) . ^T\) if the imaginary unit in Eq. 36. is not extracted explicitly
Fægri K Jr (2001) Theor Chem Acc 105:252
Ramsey NF (1950) Phys Rev 78:699
Kutzelnigg W (2003) Phys Rev A 67:032109
Xiao Y, Liu W, Cheng L, Peng D (2007) J Chem Phys 126:214101
Kutzelnigg W, Liu W (2009) J Chem Phys 131:044129
Cheng L, Xiao Y, Liu W (2009) J Chem Phys 130:144102
Cheng L, Xiao Y, Liu W (2009) J Chem Phys 131:244113
Sun Q, Liu W, Xiao Y, Cheng L (2009) J Chem Phys 131:081101
Komorovsky S, Repisky M, Malkina OL, Malkin VG, Ondík IM, Kaupp M (2008) J Chem Phys 128:104101
Repiský M, Komorovský S, Malkina OL, Malkin VG (2009) Chem Phys 356:236
Komorovsky S, Repisky M, Malkina OL, Malkin VG (2010) J Chem Phys 132:154101
Hamaya S, Fukui H (2010) Bull Chem Soc Jpn 83:635
Pecul M, Saue T, Ruud K, Rizzo A (2004) J Chem Phys 121:3051
Maldonado A, Aucar G (2007) J Chem Phys 127:154115
Acknowledgments
The research of this work was supported by grants from the National Natural Science Foundation of China (Project Nos. 20625311, 20773003 and 21033001) and from MOST of China (Project Nos. 2006CB601103 and 2006AA01A119).
Author information
Authors and Affiliations
Corresponding author
Additional information
Dedicated to Professor Pekka Pyykkö on the occasion of his 70th birthday and published as part of the Pyykkö Festschrift Issue.
Appendix: The radial Dirac equation for a hydrogenic ion in a DKB Gaussian basis
Appendix: The radial Dirac equation for a hydrogenic ion in a DKB Gaussian basis
The radial parts of the DKB basis functions (35) and (36) can be rewritten as
such that the radial parts \((P_{n\kappa}(r),Q_{n\kappa}(r))^T=(\frac{1}{r}P^{\prime}_{n\kappa}(r),\frac{1}{r}Q^\prime_{n\kappa}(r))^T\) of spinor ψ i (34) can be expanded as
The matrix representation of the radial Dirac equation
is then of the same form as Eq. 37 but with the matrix elements defined as
Note that the element for the above integrals is dr instead of r 2 dr. For Gaussian-type functions (52), i.e.,
the integrals are to be evaluated as
where
Note that DKB also involves new integrals not present in other schemes when evaluating the NMR shielding constants. However, they are not to be presented here.
Rights and permissions
About this article
Cite this article
Sun, Q., Liu, W. & Kutzelnigg, W. Comparison of restricted, unrestricted, inverse, and dual kinetic balances for four-component relativistic calculations. Theor Chem Acc 129, 423–436 (2011). https://doi.org/10.1007/s00214-010-0876-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00214-010-0876-6