Local structure dynamics in liquids: non-hydrodynamic orientational relaxation of 2-ethyl naphthalene

✍ Scribed by S.R. Greenfield; Abhijit Sengupta; John J. Stankus; M.D. Fayer

• Book ID: 103030748
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 568 KB
• Volume: 193
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)85681-y

✦ Synopsis

The rotational dynamics of 2-ethyl naphthalene have been studied from 2°C to 100°C using subpicosecond transient grating optical Kerr effect techniques. After ultrafast librational dynamics have decayed, there remains ( > 3-4 ps) a triple-exponential decay of the orientational anisotropy. The slower two decays exhibit hydrodynamic temperature dependences, corresponding to rotational diffusion. The fastest decay is not hydrodynamic, being temperature independent from 2°C to 40°C. This decay is attributed to the relaxation dynamics of local structures in the liquid.