Electron synchrotron radiation is being explored as a continuum‐radiation source of high intensity and polarization in the far‐infrared, far‐ultraviolet and soft x‐ray regions. With existing accelerators, one can obtain kilowatts of total radiation. Already, at the National Bureau of Standards, synchrotron far‐ultraviolet radiation is disclosing hundreds of new resonances in rare‐gas spectra. And synchrotron radiation sources may prove valuable for solid‐state spectroscopy as well.

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