This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Flashlamp ion spectral line radiation output. Spectral line radiation from xenon flashtube operated at high voltage and low current The tube was underenergized to allow the camera to photograph it unfiltered Although the greenishblue arc looks similar to the flash' appearance to the naked eye the bright blue reflected off the table