| MeV-UED conditions | 200 nm pump; ~330 fs instrument response; 15.4 mJ cm⁻² pump fluence |
|---|---|
| MeV-UED difference pair distribution function | Negative signals appeared near 2 Å and 3 Å within the instrument response |
| MeV-UED 2 Å feature | Depleted and reached its asymptote within the ~330 fs instrument response |
| MeV-UED 3 Å feature | Clear depletion within the instrument response followed by further, more subtle depletion on a picosecond time scale, eventually reaching its asymptote only past a few picoseconds |
| MeV-UED global target analysis (sequential kinetic model) | Time constants <330 fs (instrument-response limited) and ~1 ps |
| TR-VMI conditions | 200 nm pump; 333 nm probe for (2+1) REMPI of methyl fragments to produce CH₃⁺ ions; 153 fs instrument response (FWHM); ~8.7 mJ cm⁻² pump fluence |
| TR-VMI high-velocity feature (1), 3600–5000 m s⁻¹ | Centered near 4200 m s⁻¹; positive anisotropy; appeared within ~300 fs of 200 nm excitation |
| TR-VMI low-velocity feature (2), 1000–2500 m s⁻¹ | Centered near 1700 m s⁻¹; negative anisotropy; appeared within ~300 fs of 200 nm excitation |
| TR-VMI intermediate-velocity feature (3) | Broad velocity distribution with positive anisotropy, most evident near 3000 m s⁻¹, with picosecond intensification |
| TR-VMI feature (3) exponential-rise fit, 450–900 m s⁻¹ | τ = 14.2 ± 2.5 ps |
| TR-VMI feature (3) exponential-rise fit, 2675–3675 m s⁻¹ | τ = 12.8 ± 1.8 ps |
| TR-VMI feature (3) fit model | Exponential rise function convoluted with a Gaussian to model the instrument response; red data points were masked for fitting |
Neil C. Cole-Filipiak et al. “Ultrafast dynamics of competing dimethyl disulfide photodissociation pathways.” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15001821/v2