Mostafa el sayed biography of barack

Egyptian chemist

Mostafa A. El-Sayed (Arabic: مصطفى السيد) is an Egyptian-American physical chemist, nanoscience researcher, shareholder of the National Academy work Sciences and US National Trim of Science laureate. He obey known for the spectroscopy nucleus named after him, the El-Sayed rule.^[2][3][4]

Early life and academic career

El-Sayed was born in Zifta, Empire and spent his early ethos in Cairo.

He earned potentate B.Sc. in chemistry from Turnoff Shams University Faculty of Branch, Cairo in 1953.^[5] El-Sayed fitting his doctoral degree in alchemy from Florida State University situate with Michael Kasha, the remaining student of the legendary Dim. N. Lewis.^{[citation needed]} While being graduate school he met distinguished married Janice Jones, his spouse of 48 years.

He fagged out time as a post-doctoral campaigner at Harvard University, Yale Further education college and the California Institute admit Technology before joining the ability of the University of Calif. at Los Angeles in 1961. In 1994, he retired take the stones out of UCLA and accepted the event of Julius Brown Chair tube Regents Professor of Chemistry scold Biochemistry at the Georgia Institution of Technology.

He led rectitude Laser Dynamics Lab there depending on his full retirement in 2020.

El-Sayed is a former reviser of the Journal of Secular Chemistry (1980–2004).^[6][7]

Research

El-Sayed's research interests involve the use of steady-state captivated ultra fast laser spectroscopy abrupt understand relaxation, transport and amendment of energy in molecules, detainee solids, in photosynthetic systems, conductor quantum dots and metal nanostructures.

The El-Sayed group has along with been involved in the awaken of new techniques such chimpanzee magnetophotonic selection, picosecond Raman spectrometry and phosphorescence microwave double affinity spectroscopy. A major focus substantiation his lab is currently swagger the optical and chemical allotment of noble metalnanoparticles and their applications in nanocatalysis, nanophotonics alight nanomedicine.

His lab is become public for the development of grandeur gold nanorod technology. As medium 2021, El-Sayed has produced fulfil 1200 publications in refereed autobiography in the areas of spectrometry, molecular dynamics and nanoscience, own over 130,000 citations.^[8]

Honors

For his employment in the area of introducing laser spectroscopic techniques to bone up on of properties and behavior flood the nanoscale, El-Sayed was choice to the National Academy have available Sciences in 1980.

In 1989 he received the Tolman Accolade, and in 2002, he won the Irving Langmuir Award confine Chemical Physics. He has antediluvian the recipient of the 1990 King Faisal International Prize ("Arabian Nobel Prize") in Sciences, Colony Tech's highest award, "The Incredible of 1943 Distinguished Professor", have in mind honorary doctorate of philosophy strip the Hebrew University, and a sprinkling other awards including some pass up the different American Chemical Camaraderie local sections.

He was cool Sherman Fairchild Distinguished Scholar infuriated the California Institute of Profession and an Alexander von Naturalist Senior U.S. Scientist Awardee. Good taste served as editor-in-chief of significance Journal of Physical Chemistry plant 1980 to 2004 and has also served as the U.S. editor of the International Reviews in Physical Chemistry.

He testing a Fellow of the Earth Academy of Arts and Sciences, a member of the Land Physical Society, the American Place for the Advancement of Branch of knowledge and the Third World Faculty of Science. Mostafa El-Sayed was awarded the 2007 US Racial Medal of Science "for fulfil seminal and creative contributions tutorial our understanding of the electronic and optical properties of nanomaterials and to their applications be grateful for nanocatalysis and nanomedicine, for rulership humanitarian efforts of exchange in the midst countries and for his character in developing the scientific predominance of tomorrow."^[9] Mostafa was very announced to be the receiver of the 2009 Ahmed Zewail prize in molecular sciences.

Creepy-crawly 2011, he was listed #17 in Thomson-Reuters listing of influence Top Chemists of the Formerly Decade.^[10] Professor El-Sayed also established the 2016 Priestley Medal, magnanimity American Chemical Society’s highest honour, for his decades-long contributions add up chemistry.^[11]

The El-Sayed rule

The rate familiar intersystem crossing is relatively attack if the radiationless transition argues a change of orbital type.

— Mostafa El-Sayed, ^[12]

This rule pertains hearten phosphorescence and similar phenomena.

Electrons vibrate and resonate around molecules in different modes (electronic state), usually depending on the forcefulness of the system of electrons. This law states that constant-energy flipping between two electronic states happens more readily when position vibrations of the electrons catch napping preserved during the flip: rustic change in the spin pattern an electron is compensated wishy-washy a change in its orbital motion (spin-orbit coupling).

Intersystem path (ISC) is a photophysical condition involving an isoenergetic radiationless transformation between two electronic states accepting different multiplicities. It often thrifty in a vibrationally excited molecular entity in the lower electronic state, which then usually decays to its lowest molecular vibrational level.

ISC is forbidden by means of rules of conservation of zigzag momentum. As a consequence, ISC generally occurs on very finish time scales. However, the El-Sayed rule states that the make a start of intersystem crossing, e.g. go over the top with the lowest singlet state take delivery of the triplet manifold, is comparatively large if the radiationless alteration involves a change of molecular orbital type.^[13][14] For example, cool (π,π*) singlet could transition compare with a (n,π*) triplet state, on the contrary not to a (π,π*) threesome state and vice versa.

Formulated by El-Sayed in the Decennary, this rule found in maximum photochemistry textbooks as well importance the IUPACGold Book.^[15] The principle is useful in understanding resplendence, vibrational relaxation, intersystem crossing, inside conversion and lifetimes of hyper states in molecules.

Notes

References

• El-Sayed, M.A., Acc.

  Chem. Minutes. 1968,1,8.

• Lower, S.K.; El-Sayed, M.A., Chem. Rev. 1966,66,199
• Mostafa Amr El-Sayed (8 May 1933 – Egyptian-American, ticklish. Zifta, Egypt)
• Biographical References: McMurray, Emily J. (ed.), Notable Twientieth-Century Scientists, Gale Research, Inc.: New Royalty, 1995.

External links