# below the barrier *w*(*r*) = exp(–0.04 *r*^{2})

### The potential (red line is the energy)

## Calculation of classical trajectories

### Plot of trajectories on the potential surface

### Mapping (*y*, *t*) –> (*q*_{x}, *q*_{y})

### Zeroes of the Jacobian

Left: red curves show the points where Jacobian of the transformation (*y*, *t*) –> (*q*_{x}, *q*_{y}) is zero.

Right: blue curves show the points where Jacobian of the transformation (*y*, *t*) –> (*p*_{x}, *p*_{y}) is zero.
### Caustics

The same as above, but mapped into (*q*_{x}, *q*_{y}) plane.
## Exact calculations

### Phase shift vs. angular momentum for partial waves

### Absolute value of the wavefunction

### Real part of the wavefunction

Animation
## Semiclassical calculations

*R* = 5

### Dependence of angle chi on angle phi for the given *R* = 5

### Primitive semiclassical (black) vs. exact wavefunction (red curves) for the given *R* = 5.

Plots show absolute value, real part, and number of contributing trajectories as a function of *x*

*R* = 10

### Dependence of angle chi on angle phi for the given *R* = 10

### Primitive semiclassical (black) vs. exact wavefunction (red curves) for the given *R* = 10.

Plots show absolute value, real part, and number of contributing trajectories as a function of *x*

*R* = 15

### Dependence of angle chi on angle phi for the given *R* = 15

### Primitive semiclassical (black) vs. exact wavefunction (red curves) for the given *R* = 15.

Plots show absolute value, real part, and number of contributing trajectories as a function of *x*

*R* = 20

### Dependence of angle chi on angle phi for the given *R* = 20

### Primitive semiclassical (black) vs. exact wavefunction (red curves) for the given *R* = 20.

Plots show absolute value, real part, and number of contributing trajectories as a function of *x*

### More examples of potentials

Table of examples of two-dimensional potentials