Coherent Soft-X-Ray Dynamic Light Scattering from Smectic-A Films

Journal Article · Fri Jan 01 00:00:00 EST 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.82.755· OSTI ID:295570

Price, A C; Sorensen, L B ^[1]; Kevan, S D; Toner, J ^[2]; Poniewierski, A; Holyst, R ^[3]

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1. Physics Department, University of Washington, Seattle, Washington 98195 (United States)
2. Physics Department, University of Oregon, Eugene, Oregon 97403 (United States)
3. Institute of Physical Chemistry and College of Science, Polish Academy of Sciences, Warsaw (Poland)

We have used coherent soft-x-ray dynamic light scattering at the Bragg peak to measure the thermally driven layer fluctuations in freely suspended films of five different smectic-A liquid crystals: 4O.8, 7O.7, 8CB, 8OCB, and 10OCB. The measured relaxation times at a scattering wave vector corresponding to the interlayer spacing (2{pi}q{sup {minus}1}{approx}30 {Angstrom} ) ranged from 2 to 60 {mu}s for films from 4 to 50 {mu}m thick. Thus, we have achieved the same time resolution as conventional laser dynamic light scattering, but with 100 times higher spatial resolution. {copyright} {ital 1999} {ital The American Physical Society}

• DOE Contract Number: FG06-86ER45275
• OSTI ID: 295570
• Journal Information: Physical Review Letters, Vol. 82, Issue 4; Other Information: PBD: Jan 1999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
LIQUID CRYSTALS
LIGHT SCATTERING
RELAXATION TIME
ADVANCED LIGHT SOURCE
ONDULATOR RADIATION
VISCOSITY
SOFT X RADIATION
THICKNESS
THIN FILMS
FLUCTUATIONS