MoessbauerIsotope
- class nexus.MoessbauerIsotope(isotope='none', element='', mass=0.0, energy=0.0, lifetime=0.0, internal_conversion=0.0, multipolarity=0, mixing_ratio_E2M1=0.0, spin_ground=0.0, spin_excited=0.0, gfactor_ground=0.0, gfactor_excited=0.0, quadrupole_ground=0.0, quadrupole_excited=0.0, interference_term=0.0)
Constructor for the
MoessbauerIsotope
class.- Parameters:
isotope (string) – User identifier. Should be given in the format “mass number-element”, e.g. “57-Fe”.
element (string) – Element symbol, e.g. “Fe” for iron.
mass (float) – Isotope mass in unified atomic mass unit / Daltons (u).
energy (float) – Transition energy (eV).
lifetime (float) –
Life time (seconds).
Changed in version 1.2.0: version < 1.2.0 in nanoseconds, since 1.2.0 in seconds.
internal_conversion (float or
Var
) –Internal conversion factor \(\alpha\).
Changed in version 1.2.0:
Var
input possible now.multipolarity (Multipolarity) –
Multipolarity of the transition, one of the following options
nexus.Multipolarity_E1 (0)
nexus.Multipolarity_M1 (1)
nexus.Multipolarity_E2 (2)
nexus.Multipolarity_M1E2 (3)
nexus.Multipolarity_M2 (4)
Changed in version 1.0.3: Multipolarity M2 added.
mixing_ratio_E2M1 (float or
Var
) –The mixing ratio \(\delta\) of the E2 and M1 transitions. Note, that the definition of the sign is not consistent in literature. The sign convention here is such that for 193-Ir, the mixing coefficient is positive, although it is often found negative in literature. See [Sturhahn].
”The E2/M1 mixing parameter \(\delta\) is defined as the ratio of the reduced E2 and M1 matrix elements. Thus \(\delta^2\) gives the relative intensities of E2 and M1 type radiation. The sign of \(\delta\), which describes the relative phase of the E2 and M1 waves, is a matter of definition and therefore inevitably a source of confusion.” [Wagner].
Changed in version 1.2.0:
Var
input possible now.spin_ground (float) – Spin of the ground state \(I_g\).
spin_excited (float) – Spin of the excited state \(I_e\).
gfactor_ground (float
Var
) –g-factor of the ground state \(g_g\).
Changed in version 1.2.0:
Var
input possible now.gfactor_excited (float or
Var
) –g-factor of the excited state \(g_e\).
Changed in version 1.2.0:
Var
input possible now.quadrupole_ground (float or
Var
) –Quadrupole moment of the ground state (barn).
Changed in version 1.2.0:
Var
input possible now.quadrupole_excited (float or
Var
) –Quadrupole moment of the excited state (barn).
Changed in version 1.2.0:
Var
input possible now.interference_term (float or
Var
) –Interference term of the nuclear and electronic currents (\(\beta\)).
Changed in version 1.2.0:
Var
input possible now.
- isotope
User identifier. Should be given in the format “mass number-element”, e.g. “57-Fe”.
- Type:
string
- element
Element symbol, e.g. “Fe” for iron.
- Type:
string
- mass
Isotope mass in unified atomic mass unit / Daltons (u).
- Type:
float
- energy
Transition energy (eV).
- Type:
float
- lifetime
Lifetime of the state (seconds).
- Type:
float
- internal_conversion
Internal conversion factor \(\alpha\).
Changed in version 1.2.0: version < 1.2.0 float type, now
Var
.- Type:
- multipolarity
Multipolarity of the transition, one of the following options
nexus.Multipolarity_E1 (0)
nexus.Multipolarity_M1 (1)
nexus.Multipolarity_E2 (2)
nexus.Multipolarity_M1E2 (3)
nexus.Multipolarity_M2 (4)
Changed in version 1.0.3: Multipolarity M2 added.
- Type:
Multipolarity
- L
Photon angular momentum. For mixed multipolarity M1E2, photon angular momentum of M1.
L=1 for E1 and M1 transitions
L=2 for E2 and “M2” transitions
- Type:
int
- lambda1
Scattering type (electronic or magnetic). For mixed multipolarity M1E2, scattering type of M1.
\(\lambda = 1\) for electronic E1 and E2 transition.
\(\lambda = 0\) for magnetic M1 and M2 transition.
- Type:
int
- L2
For mixed multipolarity M1E2, photon angular momentum of E2, L=2.
- Type:
int
- lambda2
For mixed multipolarity M1E2, scattering type of E2, \(\lambda = 0\).
- Type:
int
- mixing_ratio_E2M1
The mixing ratio \(\delta\) of the E2 and M1 transitions. Note, that the definition of the sign is not consistent in literature. The sign convention here is such that for 193-Ir, the mixing coefficient is positive, although it is often found negative in literature. See [Sturhahn].
“The E2/M1 mixing parameter \(\delta\) is defined as the ratio of the reduced E2 and M1 matrix elements. Thus \(\delta^2\) gives the relative intensities of E2 and M1 type radiation. The sign of \(\delta\), which describes the relative phase of the E2 and M1 waves, is a matter of definition and therefore inevitably a source of confusion.” [Wagner].
Changed in version 1.2.0: version < 1.2.0 float type, now
Var
.- Type:
- spin_ground
Spin of the ground state \(I_g\).
- Type:
float
- spin_excited
Spin of the excited state \(I_e\).
- Type:
float
- gfactor_ground
g-factor of the ground state \(g_g\).
Changed in version 1.2.0: version < 1.2.0 float type, now
Var
.- Type:
- gfactor_excited
g-factor of the excited state \(g_e\).
Changed in version 1.2.0: version < 1.2.0 float type, now
Var
.- Type:
- quadrupole_ground
Quadrupole moment of the ground state (kbarn).
Changed in version 1.2.0: version < 1.2.0 float type, now
Var
.- Type:
- quadrupole_excited
Quadrupole moment of the excited state (kbarn).
Changed in version 1.2.0: version < 1.2.0 float type , now
Var
.- Type:
- interference_term
Interference term of the nuclear and electronic currents (\(\beta\)).
Changed in version 1.2.0: version < 1.2.0 float type , now
Var
.- Type:
- atomic_number
Atomic (proton) number.
- Type:
int
- wavelength
Wavelength of the transition energy (meter).
- Type:
float
- kvector
k-vector of the transition energy (1/meter).
- Type:
float
- half_lifetime
Half lifetime of the state (seconds).
Added in version 1.0.3.
- Type:
float
- gamma
Transition linewidth (eV), \(\Gamma = \Gamma_{\gamma} + \Gamma_e\).
- Type:
float
- gamma_photon
Partial transition linewidth by gamma emission (eV).
Added in version 1.0.3.
- Type:
float
- gamma_electron
Partial transition linewidth by internal conversion (eV).
Added in version 1.0.3.
- Type:
float
- quality_factor
Quality factor \(E/\Gamma\) of the transition.
Added in version 1.0.3.
- Type:
float
- nuclear_cross_section
Nuclear cross section (kbarn).
- Type:
float
- magnetic_moment_ground
Magnetic moment of the ground state (eV/T). It is given by \(\mu_g = g_g \mu_N I_g\), where \(I_g\) is given in units of \(\hbar\).
- Type:
float
- magnetic_moment_excited
Magnetic moment of the excited state (eV/T). It is given by \(\mu_e = g_e \mu_N I_e\), where \(I_e\) is given in units of \(\hbar\).
- Type:
float
- Copy()
Copies the
MoessbauerIsotope
.
Define a Moessbauer isotope. Predefined Moessbauer Isotopes can be found in the Material library Moessbauer
.
Fe57 = nx.moessbauerIsotope(
isotope = "57-Fe",
element = "Fe",
mass = 56.9353933,
energy = 14412.497,
lifetime = 141.11, # input here in nanoseconds, is converted to seconds during initialization
internal_conversion = 8.21,
multipolarity = "M1",
mixing_ratio_E2M1 = 0,
spin_ground = 1/2,
spin_excited = 3/2,
gfactor_ground = 0.18121,
gfactor_excited = -0.10348,
quadrupole_ground = 0,
quadrupole_excited = 0.187
)
print(Fe57.wavelength)
copy_of_isotope = Fe57.Copy()