Critical harmonic scattering in NH4Cl

Isaac Freund

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Observations of harmonic scattering (second-harmonic generation) by fluctuations in angular orientation are reported for polycrystalline NH4Cl for temperatures in the immediate vicinity of the second-order phase transition at ∼242.4°K. Harmonic intensities were found to decrease exponentially within the range 2×10-4<~ε<2×10-2, where ε=TTc-1. The results, together with suitable assumptions, are used to obtain an estimate of the variation of the long-range correlation parameter κ-1 with ε, with results different from those expected.

Original languageEnglish
Pages (from-to)1288-1291
Number of pages4
JournalPhysical Review Letters
Issue number22
StatePublished - 1967
Externally publishedYes


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