英语翻译HuÈ ckel argues that the ®rst of these terms,w
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:英语作业 时间:2024/04/29 14:20:43
英语翻译
HuÈ ckel argues that the ®rst of these terms,where the (p)h
state of carbon [p p orbital in modern notation] is
singly occupied,should be the energetically lowest-lying
term for benzene; therefore,only this term is considered
in the mathematical treatments of the electronic struc-
ture.In the ®nal section of part 2 HuÈ ckel says that he is
going to use two dierent mathematical treatments for
the benzene problem.He calls them ``®rst method'' and
``second method'',which are now known as Valence
bond (VB) and MO methods,respectively.HuÈ ckel cites
papers by Heitler and London [1],Heisenberg [16],
Slater [17],and Bloch [18] as fundamental for the ®rst
(VB) method and says that he is going to use Bloch's
version for his work.For the second (MO) method he
cites another paper by Bloch [19] and the famous
publication of Hartree [20],but not Fock [21].HuÈ ckel
writes that Hartree's approximation neglects exchange
interactions,but he notes that this can be accounted for
later in the calculations.Before coming to the two
central mathematical parts of the paper,HuÈ ckel notes
that ``...it will be seen that the second method is better
suited for the real behaviour than the ®rst method.''
In the third part of the paper HuÈ ckel derives energy
expressions for the dierent electronic terms of benzene
using method 1.The wavefunction is given as a Slater
determinant,and the solution of the SchroÈ dinger equation
is expressed in analogy to the Heitler±London paper [1] as
where DW is the interaction energy between the n p
electrons which is determined by the coulomb integrals
J0 and the exchange integrals J.3 The equations for
determining DW and a are then given as
DW ÿ nJ0 n ÿ t Jal J
X
at 0 3
HuÈ ckel uses symmetry and group theoretical arguments
to ®nally derive (in chapter 5) the following energy
expressions for n electrons in n-cyclic CH compounds
given by method 1:
Chapter 4 describes the energy expressions for p
electrons in cyclic conjugated systems using the familiar
integrals a,for the energy of an unperturbed electron,
and b,for the interaction between electrons at neigh-
bouring atoms.HuÈ ckel notes that b > 0 if the wave-
function is nodeless,while b < 0 when the wavefunction
has a node (HuÈ ckel de®nes a and b in such a way that
positive values are stabilizing and negative values
destabilizing).
The important part of this chapter concerns the
wavefunction.HuÈ ckel cites Bloch [19] and notes that,for
cyclic groups,each wavefunction,v,may be expressed as...
HuÈ ckel argues that the ®rst of these terms,where the (p)h
state of carbon [p p orbital in modern notation] is
singly occupied,should be the energetically lowest-lying
term for benzene; therefore,only this term is considered
in the mathematical treatments of the electronic struc-
ture.In the ®nal section of part 2 HuÈ ckel says that he is
going to use two dierent mathematical treatments for
the benzene problem.He calls them ``®rst method'' and
``second method'',which are now known as Valence
bond (VB) and MO methods,respectively.HuÈ ckel cites
papers by Heitler and London [1],Heisenberg [16],
Slater [17],and Bloch [18] as fundamental for the ®rst
(VB) method and says that he is going to use Bloch's
version for his work.For the second (MO) method he
cites another paper by Bloch [19] and the famous
publication of Hartree [20],but not Fock [21].HuÈ ckel
writes that Hartree's approximation neglects exchange
interactions,but he notes that this can be accounted for
later in the calculations.Before coming to the two
central mathematical parts of the paper,HuÈ ckel notes
that ``...it will be seen that the second method is better
suited for the real behaviour than the ®rst method.''
In the third part of the paper HuÈ ckel derives energy
expressions for the dierent electronic terms of benzene
using method 1.The wavefunction is given as a Slater
determinant,and the solution of the SchroÈ dinger equation
is expressed in analogy to the Heitler±London paper [1] as
where DW is the interaction energy between the n p
electrons which is determined by the coulomb integrals
J0 and the exchange integrals J.3 The equations for
determining DW and a are then given as
DW ÿ nJ0 n ÿ t Jal J
X
at 0 3
HuÈ ckel uses symmetry and group theoretical arguments
to ®nally derive (in chapter 5) the following energy
expressions for n electrons in n-cyclic CH compounds
given by method 1:
Chapter 4 describes the energy expressions for p
electrons in cyclic conjugated systems using the familiar
integrals a,for the energy of an unperturbed electron,
and b,for the interaction between electrons at neigh-
bouring atoms.HuÈ ckel notes that b > 0 if the wave-
function is nodeless,while b < 0 when the wavefunction
has a node (HuÈ ckel de®nes a and b in such a way that
positive values are stabilizing and negative values
destabilizing).
The important part of this chapter concerns the
wavefunction.HuÈ ckel cites Bloch [19] and notes that,for
cyclic groups,each wavefunction,v,may be expressed as...
将上贴全部选中,单击蓝色箭头,使用Live search进行翻译
英语翻译HuÈ ckel argues that the ®rst of these terms,w
英语翻译The terms of this agreement provided that the defendant
英语翻译The theory presented above argues that multinational org
英语翻译We discovered quickly that in spite of the prayers of hu
请解析GRE难句.Gutman argues convincingly that the stability of th
英语翻译These General Terms and Conditions (the “Agreement”) gov
英语翻译The first report of the RCEP was an evalua-tion of
英语翻译15.That the form of General Terms and Conditions to be e
英语翻译We now postulate that the polymerization of these monome
英语翻译In simpler terms,the findings suggest that the brainstru
英语翻译The International translated terms of the official masco
英语翻译The terms and conditions of the charter party agreement