8 results match your criteria Annales De Physique[Journal]

  • Page 1 of 1

Infrared frequency combs and supercontinua for multiplex high sensitivity spectroscopy.

Ann Phys (Paris) 2007 Oct;710

Laboratoire de Photophysique Moléculaire, CNRS, Université Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France.

An infrared high-brightness light source based on supercontinuum generation through a SF6 photonic crystal fiber seeded by a Cr(4+):YAG femtosecond oscillator is developed for high resolution multiplex spectroscopy in the 1.5 μm region. Moreover, a multiplex high resolution approach based on a Cr(4+):YAG frequency comb enables to probe large spectral domains, with simultaneous sensitive measurement of the absorption and the dispersion associated with all individual spectral features. Read More

View Article and Full-Text PDF
October 2007

Chemical evolution of interstellar dust, comets and the origins of life.

Ann Phys (Paris) 1989 Apr;14:103-31

Laboratory Astrophysics, University of Leiden, The Netherlands.

It now appears that the chemical evolution of the pre-solar system interstellar dust ensures that a major fraction of comets is in the form of complex organic molecules at least partially of a prebiotic nature and that the submicron interstellar dust preserves its chemical integrity as result of forming a very tenuous low density comet structure whose solid matter occupies approximately 1/5 of the total volume. This low density micro structure further provides a physical basis for comets bringing a significant fraction of the original interstellar organic molecules to the earth unmodified by the impact event. Finally, the evidence for a large number of comet collisions with the early earth ensured that the major organic molecular budget on the earth's surface was "continuously" supplied along with water well before 3. Read More

View Article and Full-Text PDF
  • Page 1 of 1