1928 (experimental reports) / South & Southeast Asia
Raman and Krishnan identify shifted scattered light
Working in Calcutta, Raman and Krishnan observed frequency changes in a small portion of scattered light, opening a new route to identifying molecular properties.
The story
At the Indian Association for the Cultivation of Science, Raman and Krishnan investigated light scattered by matter. The frequency shifts later called the Raman effect reflect changes in molecular energy and became useful in spectroscopy. Raman received the Nobel Prize in 1930; that is not the discovery year. Krishnan and the wider research team should remain visible in this account.
Connections and context
Optical measurements turned molecular energy changes into comparable spectral signatures. Research in colonial India also shows that modern physics developed beyond European and North American laboratories.
Dates and precision
1928 (experimental reports) Documented date
Positioned by the documented year, month or day. Missing precision is not inferred.
Representative map location
Calcutta (Kolkata)
The marker represents the association’s historical Calcutta research setting, not its later relocated campus.
Representative coordinates · 22.567°, 88.352°
A marker identifies one representative place, such as a manuscript collection, laboratory or observing site. It does not mean the work happened only there, or assign a shared discovery to one country.
Bibliography
- Raman and Krishnan’s 1928 report and IACS history
- IACS Annual Report 2016–2017: Raman and Krishnan
- C. V. Raman: biographical account
References are listed as plain bibliography titles. They support particular facts or context; a reference does not certify every interpretation in a story.