Zewail's key work has been as the pioneer of femtochemistry.

Heller's work laid the foundations for a theoretical understanding of femtochemistry.

A new area in chemistry emerged, femtochemistry, and new femtotechnologies were developed.

He is credited with having founded femtochemistry, which laid the groundwork for developments in femtobiology.

Femtochemistry allows exploration of which chemical reactions take place, and investigates why some reactions occur but not others.

Femtochemistry - is the area of physical chemistry that studies chemical reactions on extremely short timescales, approximately 10-15 seconds (one femtosecond).

Ahmed Zewail from Caltech was awarded the 1999 Nobel Prize in Chemistry for his work on femtochemistry.

Those applications are emerging from a new branch of science called femtochemistry, the study of ultrafast chemical processes, for which a Nobel Prize was awarded last year.

His most recent work in femtochemistry was in collaboration with Ahmed H. Zewall of the California Institute of Technology.

Dr. Bernstein was among the scientists who devised techniques now commonly used in "femtochemistry," the study of chemical events that occur in only about one-quadrillionth of a second, or femtosecond.

Among many applications of the technique, femtochemistry has been used to study the complex and lightning-fast chemical changes that occur in rodopsin, a pigment in the eye's retina essential to vision.

Ahmed Zewail, in 1999 won the Nobel Prize in chemistry for his work in femtochemistry, methods that allow the description of change states in femtoseconds or very short seconds.

The 1999 Nobel Prize in Chemistry was awarded to Ahmed H. Zewail for using ultrashort pulses to observe chemical reactions on the timescales they occur on, opening up the field of femtochemistry.

Dr. Ed Wasserman, president of the American Chemical Society, described Dr. Zewail as "the father of femtochemistry," the chemistry that occurs on a time scale of extremely small fractions of a second.

The range of topics covered in these areas is extensive, from Molecular Interaction and Reactivity to Spectroscopy and Thermodynamics of Clusters, from Atomic Optics to Bose-Einstein Condensation to Femtochemistry.

Zewail was awarded the 1999 Nobel Prize in Chemistry for his seminal work in the field of femtochemistry, which made it possible to observe molecular changes measured in femtoseconds, a measurement equal to a millionth of a billionth of a second.