Ahmed H. Professor Zewail pioneered the use of femtosecond spectroscopy. The method uses ultrashort laser pulses and allows the detailed study of chemical reactions and their transition states. For this breakthrough, he received the Nobel Prize in Chemistry Zewail studied chemistry at Alexandria University, Egypt, where he finished his B.

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Ahmed H. The breakthrough created a new field of physical chemistry known as femtochemistry. Zewail was the first Egyptian and the first Arab to win a Nobel Prize in a science category. After receiving B. Because chemical reactions last only 10 to femtoseconds fs —one femtosecond is 0.

In the late s, however, Zewail was able to view the motion of atoms and molecules by using a method based on new laser technology capable of producing light flashes just tens of femtoseconds in duration. During the process, known as femtosecond spectroscopy, molecules were mixed together in a vacuum tube in which an ultrafast laser beamed two pulses. The first pulse supplied the energy for the reaction, and the second examined the ongoing action.

The characteristic spectra, or light patterns, from the molecules were then studied to determine the structural changes of the molecules. Zewail also used elements of femtochemistry to invent a 4D electron microscope , with which operators were able to investigate the dynamics of atoms one billion times faster than they could with previous microscopes.

Applications range from how catalysts function and how molecular electronic components must be designed, to the most delicate mechanisms in life processes and how the medicines of the future should be produced. Article Media. Info Print Cite. Submit Feedback. Thank you for your feedback. Home Science Chemistry. See Article History.

Britannica Quiz. Famous American Faces: Fact or Fiction? Get exclusive access to content from our First Edition with your subscription. Subscribe today. Learn More in these related Britannica articles:. Egyptian-born chemist Ahmed Zewail won the Nobel Prize for Chemistry in for his work in this field.

It is conferred by the Royal Swedish Academy of Sciences…. Chemical reaction , a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds.

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. History at your fingertips.

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Ahmed H. Zewail

MY HERO Project seeks unique works of art by professional and student artists that celebrate the lives and courageous acts of heroes who work to promote change by positively affecting others and their communities. Completed artwork should reflect thoughtful ideas to show how the selected hero demonstrates heroic action and creates positive social change. Accepting Ongoing Submissions! You do not have to walk on your knees For a hundred miles through From the spoken words of influential leaders, to emotionally powerful lyrics in a song, heroic audio is all around us. Deadline: JUNE 1st. He is an Egyptian scientist and he is also a holder of the American nationality.


Ahmed Zewail

Ahmed H. The breakthrough created a new field of physical chemistry known as femtochemistry. Zewail was the first Egyptian and the first Arab to win a Nobel Prize in a science category. After receiving B. Because chemical reactions last only 10 to femtoseconds fs —one femtosecond is 0.


Ahmed Zewail, 1946–2016

He was 70 years old. Zewail was the sole recipient of the Nobel Prize in Chemistry for his pioneering developments in femtoscience, making possible observations of atoms in motion on the femtosecond 10 seconds time scale. These developments led to the establishment of the discipline of femtochemistry. For his contributions to science and for his public service, Zewail received honors from around the globe. Postage stamps have been issued in commemoration of his contributions to science and humanity.


Ahmed H. Zewail (1946 – 2016)

Zewail had been nominated and participated in President Barack Obama's Presidential Council of Advisors on Science and Technology PCAST , an advisory group of the nation's leading scientists and engineers to advise the President and Vice President and formulate policy in the areas of science, technology, and innovation. Zewail's key work was an explorer of femtochemistry [3] [9] [10] —i. Using a rapid ultrafast laser technique consisting of ultrashort laser flashes , the technique allows the description of reactions on very short time scales — short enough to analyse transition states in selected chemical reactions. When asked about rumors that he might contest the Egyptian presidential election , Ahmed Zewail said: "I am a frank man I have no political ambition, as I have stressed repeatedly that I only want to serve Egypt in the field of science and die as a scientist. During the Egyptian protests he announced his return to the country.

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