• When things vibrate, they make sounds. • Molecules do too, but at frequencies far beyond human hearing. • Chemical bonds stretch, bend, and twist at characteristic rates that fall in the infrared region of the electromagnetic spectrum. • Infrared spectroscopy, which measures how light excites these vibrations, is often likened to listening to a molecule’s voice.
Article Summaries:
- Scientists have successfully recorded the vibrational “voice” of a single molecule by combining infrared spectroscopy with scanning tunneling microscopy (STM). By directing infrared light onto a molecule adsorbed on a conductive surface and measuring the resulting tunneling current, researchers could detect the characteristic stretching, bending, and twisting motions of chemical bonds. This technique allows direct observation of molecular vibrations at the single‑molecule level, offering a powerful tool for probing chemical dynamics and bonding with unprecedented spatial resolution.
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