The more general exponential screened coulomb (MGESC) potential is known to describe adequately the effective potential of a many–body system of a variety of fields such as the atomic, solid state, plasma and quantum field theory.1–4 In particularity, this potential used to calculate the bounded state eigen values of molecules
The noncommutativity of space–time, which known firstly by Heisenberg and was formalized by Snyder at 1947, suggest by the physical recent results in string theory. Very recently, several authors have attempted to obtain either the exact or approximate solutions of the non–relativistic Schrodinger equation or two relativistic (Klein–Gordon and Dirac) equations for different potentials in NC space. We want to extended, the study of Ita et al.,3 to the case of extended quantum mechanics to the possibility of finding other applications and more profound interpretations in the sub-atomics scales on based to the works5–19 and our previously works20–40 in this context. The no relativistic energy levels for hydrogenic atoms and molecules
which interacted with NMGESC potential in the context of NC space have not been obtained yet. The purpose of the present paper is to attempt study the MSE with NMGESC potential (see below):
(1)
in (NC: 3D-RSP) symmetries using the generalized Bopp’s shift method which depend on the concepts that we present below in the third section. The new structure of extended quantum mechanics based to new NC canonical commutations relations (NNCCRs) in both Schrödinger and Heisenberg pictures ((SP) and (HP)), respectively, as follows (Throughout this paper, the natural units
will be used):5–23
(2)
However, the new operators
in (HP) are depending to the corresponding new operators
in (SP) from the following projections relations:20
(3)
Here
and
, while the dynamics of new systems
are described from the following motion equations in extended quantum mechanics: 20
(4)
the two operators
and
are presents the ordinary and new quantum Hamiltonian operators for NMGESC potential in the quantum mechanics and it’s extension, respectively, while
are describe the dynamics of systems in (NC: 3D–RSP). The very small two parameters
and
(compared to the energy) are elements of two anti symmetric real matrixes
and
denote to the new star product, which is generalized between two arbitrary functions
to the new form
in ordinary 3-dimensional space-phase:6–21
(5)
where the notion
denote to the
. The effects of (space-space) and (phase-phase) noncommutativity properties, respectively induce the second and the third terms in the above equation. The organization scheme of the recently work is given as follows: In next section, we briefly review the ordinary SE with MGESC potential on based to ref.3 The Section 3 is devoted to studying the MSE by applying the generalized Bopp's shift method for NMGESC potential. In the next subsection, by applying standard perturbation theory to find the quantum spectrum of
excited levels in for spin-orbital interaction in the framework of the global group (NC-3D: RSP) and then, we derive the magnetic spectrum for NMGESC potential. In the fourth section, we resume the global spectrum and corresponding NC Hamiltonian operator for NMGESC potential and corresponding energy levels of hydrogenic atoms and the molecules
. Finally, the concluding remarks have been presented in the last section.
Overview of the eigenfunctions and the energy eigenvalues for MGESC potential for hydrogenic atoms and molecules (CO, NO):
In this section, we shall recall here the time independent SE for a MGESC potential
, which studied by Ita et al.,2 and generalized to new form by Ita et al.,3 also in ref.: 3,4
(6)
where
and
are the strength coupling constant (the potential depth of the MGESC potential) and the screened parameter (adjustable positive parameter), respectively. The part with exp. term of eq. (6) can be expanded in the power series of r up to the second term:
(7)
Inserting eq. (7) into eq. (6), explicit form of MGESC potential is obtained as:
(8)
If we insert this potential into the Schrödinger equation (3):
(9)
Here
is the reduced mass of molecules
or the reduced mass of electron ant it’s nucleus for hydrogenic atoms. The electronic radial wave functions are shown as a function of the Laguerre polynomial in terms of some parameters:3
(10)
where
, therefore, the complete wave function
and the energy
of the potential in eq. (6) are given by:3
(11)and
(12)
With
and
for (CO and NO) molecules, for hydrogenic atoms,
can be present the average dimension between the electron and the nucleus,
is the normalization constant,
,
and
are the well-known spherical harmonic functions.
In this section, we shall give an overview or a brief preliminary for a NMGESC potential
, in (NC: 3D-RSP) symmetries. To perform this task the physical form of modified Schrödinger equation (MSE), it is necessary to replace ordinary three-dimensional Hamiltonian operators
, ordinary complex wave function
and ordinary energy
by new three Hamiltonian operators
, new complex wave function
and new values
, respectively. In addition to replace the ordinary old product by new star product
, which allow us to constructing the MSE in (NC-3D: RSP) symmetries as:21–28
(13)
The Bopp’s shift method employed in the solutions enables us to explore an effective way of obtaining the modified potential in extended quantum mechanics, it based on the following new commutators:28–34
(14)
The new generalized positions and momentum coordinates
in (NC: 3D-RSP) are depended with corresponding usual generalized positions and momentum coordinates
in ordinary quantum mechanics by the following, respectively:30–36
(15)
The above equation allows us to obtain the two operators
and
in (NC-3D: RSP):35–38
(16)
The two couplings
and
are
and
, respectively and
are the three components of angular momentum operator
while
. Thus, the reduced Schrödinger equation (without star product) can be written as:
(17)
the new operator of Hamiltonian
can be expressed as:
(18)
Now, we want to find to the NMGESC potential
:
(19)
After straightforward calculations, we can obtain the important term
, which will be use to determine the NMGESC potential in (NC: 3D- RSP) symmetries as:
(20)
By making the substitution above equation into eq. (19), we find the global our working new Hamiltonian operator
satisfies the equation in (NC: 3D-RSP) symmetries:
(21)
where the operator
is just the ordinary Hamiltonian operator with MGESC potential in commutative space:
(22)
while the rest two terms are proportional’s with two infinitesimals parameters
and then we can considered as a perturbations terms
in (NC: 3D-RSP) symmetries as:
(23)
The exact modified spin-orbital spectrum for NMGESC potential in global (NC: 3D- RSP) symmetries
In this subsection, we apply the same strategy, which we have seen in our previously works,36–40 under such particular choice, one can easily reproduce both couplings
to the new physical forms (
and
), respectively, to obtain the new forms of
for 3D- NMGESC potential as follows:
(24)
Here
is a new constant, which play the role of fine structure constant, we have chosen the two vectors
and
parallel to the spin
of hydrogenic atoms. Furthermore, the above perturbative terms
can be rewritten to the following new form:
(25)
This operator traduces the coupling between spin
and orbital momentum
. The set
,
forms a complete of conserved physics quantities and for
, the eigen values of the spin orbital coupling operator are
corresponding:
(spin up) and
(spin down), respectively then one can form a diagonal
matrix, with diagonal elements are
,
and
for NMGESC potential in (NC: 3D-RSP) symmetries, as:
(26)
After profound calculation, one can show that, the new radial function
satisfying the following differential equation for NMGESC potential:
(27)
The two terms which composed the expression of
are proportional with two infinitesimals parameters (
and
), thus, in what follows, we proceed to solve the modified radial part of the MSE that is, equation (27) by applying standard perturbation theory for their exact solutions at first order of two parameters
and
.
The exact modified spin-orbital spectrum for NMGESC potential in extended global (NC: 3D- RSP) symmetries
The purpose here is to give a complete prescription for determine the energy level of
excited states, of hydrogenic atoms with NMGESC potential, we first find the corrections
and
for hydrogenic atoms which have
(spin up) and
(spin down), respectively, at first order of two parameters
and
obtained by applying the standard perturbation theory to find the following:
(28)
Now, we can write the above two equations to the new form:
(29)
Moreover, the expressions of the three factors
are given by:
(30)
To evaluate the above factors
we apply the following special integration:41
(31)
where
is obtained from the generalized hyper geometric function.
for
while
denote to the usual Gamma function. After straightforward calculations, we can obtain the explicitly results:
(32)
We have
,
and
, allow us the two to obtain the exact modifications
and
of
excited states of hydrogenic atoms with NMGESC potential, which produced by modified spin-orbital effect
as:
(33)
Where
is given by:
(34)
Thus, the extended global quantum group symmetry (NC: 3D-RSP) reduce to new quantum subgroup symmetry (NC: 3D-RS).
The exact modified magnetic spectrum for NMGESC potential in extended global (NC: 3D- RSP) symmetries:
Further to the important previously obtained results, now, we consider another physically meaningful phenomena produced by the effect of NMGESC potential related to the influence of an external uniform magnetic field
, to avoid the repetition in the theoretical calculations, it’s sufficient to apply the following replacements:
(35)
Here
and
are two infinitesimal real proportional’s constants, and we choose the arbitrary external magnetic field
parallel to the (Oz) axis, which allow us to introduce the new modified magnetic Hamiltonian
in (NC: 3D-RSP) symmetries as:
(36)
Here
denote to the modified Zeeman effect while
is the ordinary Hamiltonian operator of Zeeman Effect. To obtain the exact noncommutative magnetic modifications of energy
, we just replace
and
in the eq. (33) by the following parameters:
and
, respectively:
(37)
We have
, which allow us to fixing (
) values for discreet number
.
In the light of the results of the preceding sections, let us resume the modified eigenenergies
and
of a hydrogenic atoms with spin
for MSE with NMGESC potential obtained in this paper, the total energies corresponding
excited states in (NC: 3D-RSP) symmetries are determined on based to our original results presented on the Eqs. (33) and (37), in addition to the ordinary energy
MGESC potential, which presented in the eq. (13):
(38)
This is the main goal of this work, It’s clearly, that the obtained eigenvalues of energies are real’s and then the noncommutative diagonal Hamiltonian
is Hermitian, furthermore it’s possible to writing the three elements:
as follows:
(39)
Where
(40)
Thus, the ordinary kinetic term for MGESC potential
and ordinary interaction
>are replaced by new modified form of kinetic term
and new modified interactions modified to the new form (
and
). On the other hand, it is evident to consider the quantum number
takes
values and we have also two values for
, thus every state in usually three dimensional space of energy for NMGESC potential will be
sub-states. To obtain the total complete degeneracy of energy level of the NMGESC potential in noncommutative three-dimension spaces-phases, we need to sum for all allowed values of
. Total degeneracy is thus,
(41)
Note that the obtained new energy eigen values
and
now depend to new discrete atomic quantum numbers
in addition to the parameter
of the potential. It is pertinent to note that when the molecules
have
, the total operator can be obtains from the interval
, which allow us to obtaining the eigenvalues of the operator
as
and then the non-relativistic energy spectrum
reads:
(42)
Paying attention to the behavior of the spectrums (38) and (42)
, it is possible to recover the results of commutative space (12) when we consider
. Finlay, we can say that the results we have obtained in our recently research are more profound than the results listed in our reference.20