Schrodinger equation Definition and 569 Threads

Homework Statement Find the width L of a one-dimensional box for which n=5 level would correspond to the absolute value of the n=3 state of a hydrogen atom Homework Equations am i suppose to use n2h2/8mL2 where n=5 to equate it to the n=3 state of the hydrogen atom? which is -13.6eV/32...

http://img18.imageshack.us/img18/4295/eqn.png here is the text preceding the exercise: http://yfrog.com/5mch5p in the exercise, where does the factor \frac{m}{(2mE)^{1/2}} come from? Comparing that equation with 5.19 (bottom right of link), why can't we just replace |p> with |E,+> and |E,->...

hi is there any way we can find \Psi(x,t) for a given \psi(x,0) ? i got stuck with schrodinger equation...

Hi everybody! I'm studying the simple case of the solution of the Schrodinger equation for a step potential "[URL .[/URL] As my professor states , the transmission coefficient is 0 when the energy of the particle is E<V. I really don't get how this result is not a contradiction with the fact...

Hi, I'm a physics undergraduate, and I'm having trouble understanding Atomic Physics right now. At first I thought it (the question in the title) is possible, but then I think I got confused with particle in a box. So I refer to textbooks and look for answers in the internet, and confirmed...

Hi Most of my work in the past has been on 1D independent particle systems where I use matrix diagonalisation to solve the time-independent Schrodinger equation. How do I go about this for 2D? Or, more accurately, for a two-body wf in 1D? It strikes me as straightforward to construct a...

Homework Statement I have just started quantum mechanics bacuase i want to prepare for my class starting in march. I must say so far i find it very confusing: I could use some help with this problem and in addition some explanation on the logic of what it all means. i get that this theory...

Sorry in advance my english, I tried to translate it to english as good as I can Homework Statement When l has its maximum value, the hydrogen atom radial equation has a simple form of R(r) = Arn-1e-r/na0, where a0 is Bohr's radius. Write the respective radial schrödinger equation. Homework...

Homework Statement One possible solution for the wave function ψn for the simple harmonic oscillator is ψn = A (2*αx2 -1 ) e-αx2/2 where A is a constant. What is the value of the energy level En? Homework Equations The time independent Schrodinger wave equation d2ψ / dx2 =...

We started Quantum Physics in class, and I tried working out the Schrodinger Equation (not mathematically, of course - that's far beyond my level. Just the vague concepts) I understand it's basically a function that shows how something changes in time, and a snapshot of it at one particular...

Homework Statement I am trying to find the coefficients in a Schrodinger equation approaching a finite potential. https://www.physicsforums.com/showthread.php?t=203385 It is a problem similar to this, except a little easier. In my case, though, there is no V1 as shown in the picture at the...

Hey guys, I am trying to understand where did this equation exactly come from. I know it is very complex, but anyone can explain it to me in the best way possible?

Homework Statement Consider an electron in the hydrogen atom with radial wave function R_{31} (n=3, l=1). Please verify that this radial function verifies the radial equation. Homework Equations The radial equation \frac{1}{r^{2}}\frac{d}{dr}\left(r^{2}\frac{dR}{dr}\right) +...

The Schrodinger equation with the minimal coupling to the Electromagnetic field, in the Coulomb gauge \nabla \cdot A , has a continuity equation \partial_t \rho = \nabla \cdot j where j \propto Re[p^* D p] (D is the covariant gradient D= \nabla + iA . My question is: is there any...

Homework Statement Solve the time independent Schrodinger equation for an electron in a 2-D potential well having dimensions Lx and Ly in the x and y directions respectively.Homework Equations d^2Y/dx^2 + d^2Y/dy^2 + 2m/h^2*EY = 0The Attempt at a Solution Y(x) = A exp(jkx) + B exp(-jkx) I'm...

Homework Statement It's a two-part problem, the first part was deriving a Schrodinger equation from when x = r cos(theta) and y = r sin(theta) I got: -\frac{\hbar^2}{2m}[\frac{\partial^2}{\partial...

in schrodinger equation(time independent) d^2y/dx2= 2m/h^2(V-E)y, V is a function of position coordinate, y is eigenfunction. if E>V , y being -ve or +ve it would be a oscillatory function. The allowed energy values are continously distributed...

hi, today i learned that if the mass in schrodinger equation is not a constant, then schrodinger equation is not valid. Is there any reason why is it so? Also, what is the different of the time dependent mass m(t) and let say a time dependent angular frequency \omega(t) in a harmonic...

Homework Statement b)Use the equations a_{-}|\varphi_0\rangle=0 \implies \left(\left(\frac{k}{2}\right)^{1/2}x-\left(\frac{1}{2k/(2m)^(1/2)}\right)^{1/2}\frac{d}{d x}\right)\varphi_0(x)=0 and a_{+}|\varphi_0\rangle=0 \implies...

Homework Statement the ground state wave function for 1-d SHM oscillator is fixed by the diff. eqn a*phi-0=0using the expression for the lower operator as a differential operator,a-=(K/2)1/2x-h*(\partial)/(2pi*(2m)1/2), to find a solution for this differential equation for phi0(x)...

Hi, is this the time independent schrodinger equation for a simple harmonic oscillator? -\frac{1}{2}\frac{d^{2}\psi}{dx^2}+\frac{1}{2}x^{2}\psi(x)=\epsilon\psi(x) where epsilon is the rescaled energy eigenvalue.

Homework Statement I wonder if someone could help me to arrive at equation 2.56 by performing the substitutions. Please see the attachment Homework Equations Please see the attachment for this part. and also for the attempt of a solution.

Hi everyone, I've recently been bugged by a question I can't seem to find a reasonable answer to. It's about an apparent contradiction between how the wave equation is supposed to evolve in time according to the schrodinger equation and the measurement formalism in QM. Suppose I have any...

Homework Statement hey I am vaibhav,16 an 12th grade..just for pastime i tried to solve schrodinger equation in the 1D 2D 3D spaces. i got the 1D solution(not quantum oscillator), i separated in 2D by polar coordinates but there is a problem in the radial equation as for 3D i know that the...

Homework Statement hey I am vaibhav,16 an 12th grade..just as pastime i tried to solve schrodinger equation in the 1D 2D 3D spaces. i got the 1D solution(not quantum oscillator), i separated in 2D by polar coordinates but there is a problem in the radial equation as for 3D i know that the...

Homework Statement Hey guys. I have this problem: http://img32.imageshack.us/img32/1561/78854429.jpg For the first part, I believe that adding those solution is just like adding the two levels of energy they represents and that's way this is not a solution for the equation, I...

Homework Statement For a harmonic oscillator in a state such that a measurement of energy would give either 1/2\hbar\omega or 3/2\hbar\omega with equal probabily. Write the wavefunction solution to the time-dependent Schrodinger equation. 2. The attempt at a solution Given those...

Schrodinger equation of a free particle in the rectilinear With the wave function in the laboratory reference already known, relate the wave functions of the initial and new references via phase factors, and represent the time and spatial derivatives of the initial wave function with those...

Homework Statement Show by direct substitution into the time-independent Schrodinger equation that such a particle could be described by the state function Ψ(x) = Ψ_0exp(-ax^2) with a, Ψ_0 constants Homework Equations V(x) = (1/2)kx^2 time independant equation: The Attempt...

i can't seem to understand something very basic about the stationary equation (a "simple" eigenvalue problem): H|Y>=E|Y> H - hamiltonian operator Y - an eigenstate or an eigenfunction of the hamiltonian E - the eigenvalue of the eigenstate as far as i understand, the hamilotian...

Could someone guide me step by step from the free SE to T(t)=e^(iE_n t)/\hbar ? I am not really familiar with PDEs of any kind and I would like slow step by step analysis! I am just confused by the great many ways of getting from there to there I find in books and Internet, so I would like...

[b]1. State the one dimensional time - INdependant Schrodinger equation for a particle of mass m and total energy E in a potential V(x). For an infinite square potential well V(x)=0 (0<x<l) and V(x) = infinite (all other x) find a general solutionfor the wavefunction of this function of this...

SOLVED: Schrodinger equation reduction using substitution Homework Statement Given \frac{d^2 \psi}{dx^2} - Ax\psi + B\psi = 0 make a substitution using w= A^{1/3} (x - \frac{B}{A}) to get \frac{d^2 \psi}{dw^2} - w\psi = 0 Homework Equations The Attempt at a Solution...

It seems like there should be a discrete-time discrete-space analog to the Schrodinger equation. For example, you can apply the classic explicit finite difference method to the heat equation and get a simple binomial or trinomial tree relationship in a lattice. When I try that with the...

If we solve the Schrodinger Equation for hydrogen atom, we get discrete energy levels that agree with experiment. But no where we need the wave function collapse. So my question is where the wave function come from and why do we need it?

Hello, I would like to ask something about central potentials. When I am working in 3D, I haven´t got any problem solving the schrodinger equation since I use the following change of variables: -\frac{\hbar^{2}}{2m}\nabla^{2}\Psi+V(r)\Psi=E\Psi \Psi=\frac{\chi}{r} With this change of...

Homework Statement Verify that for the wave function |\Psi| = a2|\Psi21| + B2|\Psi22| + 2aB\Psi1\Psi2cos(w21t) all psis are really psi(x) and the left side of the equation is pis(x,t) Homework Equations a B psi's are all real The Attempt at a Solution We are not sure about...

i now need to integrate the time-dependent schrodinger equation in 2D the potential is rotationally invariant and so is the initial wave function thus the symmetry of the initial wave function will be preserved in time Instead of a 2D equation, i now only need to integrate a 1d equation...

Homework Statement Show whether the functions psi_I = A cos(kx - wt) psi_II = A sin(kx - wt) are solutions of Schrodinger equation for a free particleHomework Equations Schrodinger equation The Attempt at a Solution For psi_I = A cos(kx - wt), d2psi_I/dx2 = -Ak2psi[/SUB]I[/SUB] dpsi_I/dt =...

Hello again! This time I have another calculus question for you, coming straight out of my study of the free Schrodinger equation, since I am not that experienced with that kind of derivative. It all starts with a given wavefunction (which I think is 2-dimensional,correct me if wrong)...

I was wondering- is it possible to derive an equation of motion for example, the Schrodinger equation from the uncertainty principle (in commutator form)? i.e. Is it possible to derive the Schrodinger equation from the following: \left[\hat{x},\hat{p}\right]=ih I gave it a shot, but of...

the schrodinger equation is sometimes called a wave equation and in my quantum mechanics text's they often show the wave equation comparing it to the schrodinger equation. i don't understand why they do this when it is of the same form as the heat equation, it's not second order in time like the...

So I've been looking online @ Schrodinger's Equation, but I still can't get a good grasp of what it's all about... All I know so far is that its part of quantum mechanics and that its solutions describe atomic and subatomic systems, electrons and atoms.. <---but what does that actually mean...

Hello, I have problem I wish to solve, and I wonder if anyone already delt with it when solving the schrodinger 2D equation. say E(x,y) is a scalar field function that complies with ( \frac{d}{dx}2+\frac{d}{dy}2 ) *E(x,y)+k(x,y)*E(x,y)=k1*E(x,y) where k(x,y)={k2 for x2+y2<R2 and 0...

Homework Statement Verify that the following are not solutions to the Schrodinger equation for a free particle: (a) \Psi(x,t) = A*Cos(kx-\omega t) (b) \Psi(x,t) = A*Sin(kx-\omega t) Homework Equations Schrodinger equation: \frac{-hbar^2}{2m}\frac{\partial^2\Psi}{\partial x^2} =...

Homework Statement Hello. I'd like to solve this: -\frac{\hbar^2}{2m}\nabla^2 \Psi(r,\theta,\phi) -U(r) \Psi(r,\theta,\phi) = E\Psi(r,\theta,\phi) Homework Equations The Attempt at a Solution I can separate the variables, but that's about it. \frac{1}{R(r)}...

Hi everyone, I'm having an issue trying to make the abstract form of the schrodinger equation: i\hbar\frac{\partial}{\partial t}\left|\psi\right\rangle = H\left|\psi\right\rangle be consistent with the form that operates on wavefunctions in the position representation...

Assume the potential in question is V = \left\{ \begin{matrix} \infty, \qquad x<0 \\ -V_0, \qquad 0\leq x \leq a \\ 0, \qquad x>a \end{matrix} \right. where V_0 is positive. if we need to find the bound state, we consider the energy is less than the potential. But the...

Homework Statement Please see attached image . Homework Equations Schrödinger Equation The Attempt at a Solution For part a ) |\psi|^{2} = A For Part b) V(x) = 0 For Part c) Just need a hint

Homework Statement Please see attached image . Homework Equations Schrödinger Equation The Attempt at a Solution For part a ) |\psi|^{2} = A For Part b) V(x) = 0 For Part c) Just need a hint