`BareHyperfine`

class nexus.BareHyperfine(weight=0.0, isomer=0.0, magnetic_field=0.0, magnetic_theta=0.0, magnetic_phi=0.0, quadrupole=0.0, quadrupole_alpha=0.0, quadrupole_beta=0.0, quadrupole_gamma=0.0, quadrupole_asymmetry=0.0, texture=1.0, lamb_moessbauer=0.0, broadening=1.0, gaussian_broadening=0.0, isotropic=False)

Constructor for BareHyperfine class. This class is only used for calculations of the nuclear Hamiltonian. Defines a set of hyperfine parameters acting on a Moessbauer isotope. Angles are input in degree but internally stored in radian.

Parameters:

weight (float) – Relative weight of the site, > 0.
isomer (float) – Isomer shift (mm/s).
magnetic_field (float) – Magnetic hyperfine field amplitude (Tesla).
magnetic_theta (float) – Polar angle of the magnetic field with respect to the beam propagation direction - photon \(k\) vector (degree).
magnetic_phi (float) – Azimuthal angle of the magnetic field with respect to the \(sigma\) direction of the beam (degree).
quadrupole (float) – Quadrupole splitting amplitude (mm/s).
quadrupole_alpha (float) – Euler angle of the electric field gradient \(\alpha\) in extrinsic ZYZ convention (degree).
quadrupole_beta (float) – Euler angle of the electric field gradient \(\beta\) in extrinsic ZYZ convention (degree).
quadrupole_gamma (float) – Euler angle of the electric field gradient \(\gamma\) in extrinsic ZYZ convention (degree).
quadrupole_asymmetry (float) – Asymmetry parameter of the electric field gradient, 0 to 1.
isotropic (bool) – If True the hyperfine site is set to 3D random distribution in both magnetic field and quadrupole splitting.
texture (float) –
Texture coefficient between 0 and 1.

Added in version 1.2.0.
lamb_moessbauer (float) –
Lamb-Moessbauer factor of the hyperfine site.

Added in version 1.2.0.
broadening (float or Var) –
Optional inhomogeneous broadening parameter. It introduces an additional Lorentzian broadening to the natural Lorentzian linewidth. The value multiplies with the natural linewidth.

Added in version 1.2.0.
gaussian_broadening (float or Var) –
Optional inhomogeneous Gaussian broadening parameter. It introduces an additional Gaussian broadening to the natural Lorentzian linewidth. The value is the FWHM of the Gaussian in units of the natural linewidth.

Added in version 2.0.0.

weight

Relative weight of the site, > 0.

Type:: float

isomer

Isomer shift (mm/s).

Type:: float

magnetic_field

Magnetic hyperfine field amplitude (Tesla).

Type:: float

magnetic_theta

Polar angle of the magnetic field with respect to the beam propagation direction - photon \(k\) vector (rad).

Type:: float

magnetic_phi

Azimuthal angle of the magnetic field with respect to the \(sigma\) direction of the beam (rad).

Type:: float

quadrupole

Quadrupole splitting amplitude (mm/s).

Type:: float

quadrupole_alpha

Euler angle of the electric field gradient \(\alpha\) in extrinsic ZYZ convention (rad).

Type:: float

quadrupole_beta

Euler angle of the electric field gradient \(\beta\) in extrinsic ZYZ convention (rad).

Type:: float

quadrupole_gamma

Euler angle of the electric field gradient \(\gamma\) in extrinsic ZYZ convention (rad).

Type:: float

quadrupole_asymmetry

Asymmetry parameter of the electric field gradient, 0 to 1.

Type:: float

isotropic

If True the hyperfine site is set to 3D random distribution in both magnetic field and quadrupole splitting.

Type:: bool

texture

Texture coefficient between 0 and 1. If isotropic is True it is not taken into account.

Added in version 1.2.0.

Type:: float

lamb_moessbauer

Lamb-Moessbauer factor of the hyperfine site. Not used if the lamb_moessbauer of the material is None.

Added in version 1.2.0.

Type:: float

broadening

Optional inhomogeneous broadening parameter. It introduces an additional Lorentzian broadening to the natural Lorentzian linewidth. The value multiplies with the natural linewidth.

Added in version 1.2.0.

Type:: float or Var

gaussian_broadening

Optional inhomogeneous Gaussian broadening parameter. It introduces an additional Gaussian broadening to the natural Lorentzian linewidth. The value is the FWHM of the Gaussian in units of the natural linewidth.

Added in version 2.0.0.

Type:: float or Var

class nexus.VectorBareHyperfine(*args): List of BareHyperfine objects.

Examples

Define a BareHyperfine object.

site = nx.BareHyperfine(
  weight = 1,
  isomer = -0.11,
  magnetic_field = 0,
  magnetic_theta = 0,
  magnetic_phi = 45,
  quadrupole = 0.8,
  quadrupole_alpha = 90,
  quadrupole_beta = 45,
  quadrupole_gamma = 0,
  quadrupole_asymmetry = 0.05,
  isotropic = False
  )

BareHyperfine

`BareHyperfine`