English: The electromagnetic spectrum. The scarcity of intense broadband sources of radiation in the 1012 hertz (terahertz) frequency range leaves us blind to a wide range of interesting phenomena.
J.M. Byrd, D.S. Robin, F. Sannibale, A.A. Zholents, and M.S. Zolotorev (Accelerator and Fusion Research Division, Berkeley Lab); Z. Hao and M.C. Martin, (ALS); and R.W. Schoenlein (Materials Sciences Division, Berkeley Lab).
Between the microwave and infrared regions, where electromagnetic waves oscillate at a frequency of 1012 hertz (terahertz), we have a noticeable blind spot. An almost limitless array of interesting phenomena occur at terahertz frequencies: Excited electrons orbit, small molecules rotate, proteins vibrate, superconducting energy gaps resonate, and gaseous and solid-state plasmas oscillate. The list goes on.
{{Information |Description={{en|1=The electromagnetic spectrum. The scarcity of intense broadband sources of radiation in the 10<sup>12</sup> hertz (terahertz) frequency range leaves us blind to a wide range of interesting phenomena.}} |Source=U.S. Dept o