A millisecond may seem a short time to you, but for molecules, this may be longer than their entire lifetime.  Dr Sergio Carbajo and his team at the SLAC National Accelerator Laboratory  capture these high speed changes using a laser that is several kilometres long, known as a free-electron laser (FEL).

Read more about their work in Research Outreach, or read the original research at https://arxiv.org/abs/2003.14400