sw_converter

Syntax

out = sw_converter(value, unitIn, unitOut)

out = sw_converter(value, unitIn, unitOut, particleName)

Description

out = sw_converter(value, unitin, unitout) will convert momentum and energy values assuming neutron as a particle.

out = sw_converter(value, unitin, unitout,particleName) will convert momentum and energy values for a given particle, such as neutron, photon, etc.

Example

Calculate the energy of a neutron (in meV) which has a wavelength of 5 Å:

sw_converter(5,'A','meV')

Output

    3.2722

Calculate the wavelength of X-ray in Å that has 7.5 keV energy:

sw_converter(7.5,'keV','A','photon')

Output

    1.6531

Input Arguments

value

Numerical input value, can be scalar or matrix with arbitrary dimensions.

unitIn

Units of the input value, one of the following string:

• 'A-1' momentum in Å\(^{-1}\),

• 'A^-1' momentum in Å\(^{-1}\),

• 'k' momentum in Å\(^{-1}\),

• 'Angstrom' wavelength in Å,

• 'lambda' wavelength in Å,

• 'A' wavelength in Å,

• 'Å' wavelength in Å,

• 'K' temperature in Kelvin,

• 'm/s' speed in m/s,

• 'J' energy in Joule,

• 'meV' energy in meV,

• 'eV' energy in eV,

• 'keV' energy in keV,

• 'THz' frequency in Thz,

• 'cm-1' \(2\pi/\lambda\) in cm\(^{-1}\),

• 'fs' wave period time in fs,

• 'ps' wave period time in ps,

• 'nm' wavelength in nm,

• 'um' wavelength in \(\mu\)m.

unitOut

Units of the output value, same strings are accepted as for unitIn.

particleName

String, the name of the particle, one of the following values: 'neutron' (default), 'proton', 'electron', 'photon', 'xray', 'light'.