Matches in SemOpenAlex for { <https://semopenalex.org/work/W1613076606> ?p ?o ?g. }
- W1613076606 endingPage "374" @default.
- W1613076606 startingPage "255" @default.
- W1613076606 abstract "The purpose of this chapter is to provide information on the recent developments in perturbation theory. In recent years, there is a great increase of interest in the application of perturbation theory to the fundamental problems of quantum chemistry. Perturbation theory is designed to deal systematically with the effects of small perturbations on physical systems when the effects of the perturbations are mathematically too difficult to calculate exactly, and the properties of the unperturbed system are known. The new applications have been mainly to atoms where the reciprocal of the atomic number, l/Z, provides a natural perturbation parameter. These may be divided into two groups. The first consists of calculations of energy levels, and is a natural outgrowth of Hylleraas's classic work on the 1/Z expansion for two-electron atoms. The applications in the second group are to the calculation of expectation values and other properties of atoms and molecules, and are of much more recent origin. There are two principal reasons for the success of these new applications: (1) sufficient accuracy is frequently obtained from knowledge of a first-order perturbed wave function, and (2) a great advantage of perturbation theory is that the functional form of the perturbed wave function is shaped by the perturbation itself." @default.
- W1613076606 created "2016-06-24" @default.
- W1613076606 creator A5006801171 @default.
- W1613076606 creator A5026905082 @default.
- W1613076606 creator A5087783229 @default.
- W1613076606 date "1964-01-01" @default.
- W1613076606 modified "2023-10-14" @default.
- W1613076606 title "Recent Developments in Perturbation Theory" @default.
- W1613076606 cites W1598210850 @default.
- W1613076606 cites W1604796879 @default.
- W1613076606 cites W1663777678 @default.
- W1613076606 cites W1821174652 @default.
- W1613076606 cites W1965425592 @default.
- W1613076606 cites W1965709396 @default.
- W1613076606 cites W1966996977 @default.
- W1613076606 cites W1967451312 @default.
- W1613076606 cites W1968181309 @default.
- W1613076606 cites W1968690916 @default.
- W1613076606 cites W1970710337 @default.
- W1613076606 cites W1971428468 @default.
- W1613076606 cites W1971701561 @default.
- W1613076606 cites W1972800520 @default.
- W1613076606 cites W1973065410 @default.
- W1613076606 cites W1973686325 @default.
- W1613076606 cites W1975610915 @default.
- W1613076606 cites W1975962719 @default.
- W1613076606 cites W1976245730 @default.
- W1613076606 cites W1977360531 @default.
- W1613076606 cites W1979936765 @default.
- W1613076606 cites W1981759893 @default.
- W1613076606 cites W1983404629 @default.
- W1613076606 cites W1984377479 @default.
- W1613076606 cites W1986203076 @default.
- W1613076606 cites W1986378350 @default.
- W1613076606 cites W1987131354 @default.
- W1613076606 cites W1989585760 @default.
- W1613076606 cites W1991058817 @default.
- W1613076606 cites W1993413737 @default.
- W1613076606 cites W1993599488 @default.
- W1613076606 cites W1994194302 @default.
- W1613076606 cites W1994720429 @default.
- W1613076606 cites W1996464975 @default.
- W1613076606 cites W1996777175 @default.
- W1613076606 cites W1996844505 @default.
- W1613076606 cites W1998140767 @default.
- W1613076606 cites W1998411741 @default.
- W1613076606 cites W1998434228 @default.
- W1613076606 cites W1998599882 @default.
- W1613076606 cites W2000074102 @default.
- W1613076606 cites W2000548178 @default.
- W1613076606 cites W2000771637 @default.
- W1613076606 cites W2007673664 @default.
- W1613076606 cites W2008842801 @default.
- W1613076606 cites W2010280733 @default.
- W1613076606 cites W2011287765 @default.
- W1613076606 cites W2012981080 @default.
- W1613076606 cites W2013233911 @default.
- W1613076606 cites W2014495121 @default.
- W1613076606 cites W2014851609 @default.
- W1613076606 cites W2015050218 @default.
- W1613076606 cites W2015064423 @default.
- W1613076606 cites W2015394994 @default.
- W1613076606 cites W2016454471 @default.
- W1613076606 cites W2019021798 @default.
- W1613076606 cites W2019043920 @default.
- W1613076606 cites W2019573981 @default.
- W1613076606 cites W2021190632 @default.
- W1613076606 cites W2022196403 @default.
- W1613076606 cites W2023154011 @default.
- W1613076606 cites W2023647062 @default.
- W1613076606 cites W2023662489 @default.
- W1613076606 cites W2023745189 @default.
- W1613076606 cites W2024276628 @default.
- W1613076606 cites W2024605834 @default.
- W1613076606 cites W2025200659 @default.
- W1613076606 cites W2026991711 @default.
- W1613076606 cites W2027105594 @default.
- W1613076606 cites W2027946483 @default.
- W1613076606 cites W2028122450 @default.
- W1613076606 cites W2028363766 @default.
- W1613076606 cites W2028395774 @default.
- W1613076606 cites W2033824900 @default.
- W1613076606 cites W2035096574 @default.
- W1613076606 cites W2035173515 @default.
- W1613076606 cites W2036030411 @default.
- W1613076606 cites W2036156685 @default.
- W1613076606 cites W2036231053 @default.
- W1613076606 cites W2036597253 @default.
- W1613076606 cites W2037797838 @default.
- W1613076606 cites W2042572678 @default.
- W1613076606 cites W2044010601 @default.
- W1613076606 cites W2044940178 @default.
- W1613076606 cites W2047200029 @default.
- W1613076606 cites W2048276293 @default.
- W1613076606 cites W2050410442 @default.
- W1613076606 cites W2050413723 @default.
- W1613076606 cites W2052116235 @default.
- W1613076606 cites W2052159550 @default.