MeV-UED Specifications

Time-resolved measurement of electron–phonon coupling

Measurement of Debye-Waller effect on multiple lattice reflections

Time-resolved studies of momentum resolved phonon dynamics

Thermal diffuse scattering measurement

Measurement of melting dynamics

Single-shot pump–probe measurements

Three dimensional measurement of structural dynamics

Measurements of positional change of multiple lattice reflections at different sample orientations

Measurement of chemical photodissociation or photoisomerization

Gas-jet UED

Measurement of novel phase of quantum materials

Cryo-UED

Electron beam energy

@360 Hz: 2 - 4 MeV

@1080 Hz: 2 - 2.3 MeV

Repetition rate

Single shot → 360 Hz & 1080 Hz

Other available rates: 1 Hz, 60 Hz, 120 Hz, 180 Hz, 540 Hz

Charge per pulse

1 - 100 fC (10⁴ - 10⁶ electrons)

Beam emittance

2 - 20 nm-rad

Bunch length

@360 Hz <150 fs FWHM**

@1080 Hz < 300 fs FWHM^#

Momentum resolution

<0.17Å^-1

Beam spot size

100-200 um (typical), 10 um (FWHM) focused

Repetition rate

Single shot → 1080 Hz

Wavelength range

200 nm, 266 nm, 400 nm, 800nm, 240 nm - 2 µm tunable, 3-15 µm tunable

Typical optical pulse energy

> 8 mJ @ 800 nm
> 0.8 mJ @ 400 nm
> 0.08 mJ @ 266 nm
~ 16  µJ @ 200 nm
For pulse energies at specific wavelengths (e.g. 260 nm – 750 nm) or other details please contact Patrick Kramer

Nominal pulse duration

75 fs (FWHM)

Optical delay

0 - 1.5 ns (physical delay stage) Contact laser group about longer delays.

Optical spot size

200 - 1500 µm (FWHM)