Struct ResolutionParams 

pub struct ResolutionParams { /* private fields */ }

Resolution function parameters for time-of-flight instruments.

Implementations

impl ResolutionParams

pub fn new( flight_path_m: f64, delta_t_us: f64, delta_l_m: f64, delta_e_us: f64, ) -> Result<Self, ResolutionParamsError>

Create validated resolution parameters.

Arguments

• flight_path_m — Flight path length in meters (must be > 0).
• delta_t_us — Timing uncertainty in microseconds (must be >= 0).
• delta_l_m — Flight path uncertainty in meters (must be >= 0).
• delta_e_us — Exponential tail parameter in SAMMY Deltae units (must be >= 0). When 0, pure Gaussian broadening is used.

Errors

Returns ResolutionParamsError::InvalidFlightPath if flight_path_m <= 0.0 or is not finite. Returns ResolutionParamsError::InvalidDeltaT if delta_t_us < 0.0 or is not finite. Returns ResolutionParamsError::InvalidDeltaL if delta_l_m < 0.0 or is not finite. Returns ResolutionParamsError::InvalidDeltaE if delta_e_us < 0.0 or is not finite.

pub fn flight_path_m(&self) -> f64

Returns the flight path length in meters.

pub fn delta_t_us(&self) -> f64

Total timing uncertainty (1σ Gaussian) in microseconds.

The factor of 2 in gaussian_width() comes from the energy-TOF derivative dE/E = 2·dt/t, not from a σ-to-FWHM conversion.

pub fn delta_l_m(&self) -> f64

Returns the flight path uncertainty (1σ Gaussian) in meters.

pub fn delta_e_us(&self) -> f64

Returns the exponential tail parameter (SAMMY Deltae units).

pub fn has_exponential_tail(&self) -> bool

Whether the exponential tail is active (Deltae > 0, SAMMY Iesopr=3).

pub fn exp_width(&self, energy_ev: f64) -> f64

Exponential tail width Widexp(E) in eV.

SAMMY Ref: rsl/mrsl4.f90 Wdsint lines 55-56 (Kedxfw=false path): Widexp = E * Co2 * sqrt(E) where Co2 = 2·Deltae / (Sm2·Dist).

Combined: Widexp = 2·Deltae·E^(3/2) / (TOF_FACTOR·L).

pub fn gaussian_width(&self, energy_ev: f64) -> f64

Gaussian resolution width σ_E(E) in eV.

Combines timing and flight-path contributions in quadrature: σ_E² = (2·Δt/t × E)² + (2·ΔL/L × E)²

where t = TOF_FACTOR × L / √E is the time-of-flight in μs.

pub fn fwhm(&self, energy_ev: f64) -> f64

FWHM of the resolution function at energy E, in eV.

Trait Implementations

impl Clone for ResolutionParams

fn clone(&self) -> ResolutionParams

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ResolutionParams

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for ResolutionParams