Leland C. Allen

Leland Cullen Allen , called Lee Allen , (born December 3, 1926 in Cincinnati , † July 15, 2012 in Princeton , New Jersey ) was an American physicist and chemist ( theoretical chemistry , quantum chemistry ).

Allen graduated from the University of Cincinnati with a bachelor's degree in 1949 and a master's degree in 1955, and received his doctorate in theoretical physics from the Massachusetts Institute of Technology in 1957 . He was then a fellow at MIT until 1959 and a Fellow of the National Science Foundation at the University of California, Berkeley in 1959/60 . In 1960 he became an assistant professor and in 1965 a professor at Princeton University . In 2001 he retired.

All of them have over 400 scientific publications and he had around 45 PhD students at Princeton. He developed a general method of calculating the electronegativity of elements in a manner understandable even for non-specialists from widely accessible data (mean value of the energy of the valence electrons):

{\ displaystyle \ chi = {n _ {\ rm {s}} \ varepsilon _ {\ rm {s}} + n _ {\ rm {p}} \ varepsilon _ {\ rm {p}} \ over n _ {\ rm {s}} + n _ {\ rm {p}}}}

where the energy levels of the s and p electrons are in the free atom and indicates their number. Usually an additional factor of 0.169 is added to the specification of the energies in electron volts in order to obtain values similar to those in the Pauling scale. ${\ displaystyle \ varepsilon _ {s, p}}$ ${\ displaystyle n_ {s, p}}$

He had been married to Alice Allen since 1960 and had three children.

In 1967 he was a Guggenheim Fellow in Oxford and a Senior Fellow of the National Science Foundation in Paris at the Center for Applied Wave Mechanics.

Fonts

LC Allen, JE Huheey: The definition of electronegativity and the chemistry of the noble gases, Journal of Inorganic and Nuclear Chemistry, Volume 42, 1980, pp. 1523-1524

Web links

Morgan Kelly, Princeton theoretical chemist and mentor Leland Allen dies , Princeton University obituary, July 25, 2012

Individual evidence

↑ Birth and career data according to American Men and Women of Science , Thomson Gale 2004

personal data
SURNAME	Allen, Leland C.
ALTERNATIVE NAMES	Allen, Leland Cullen (full name); Allen, Lee
BRIEF DESCRIPTION	American chemist
DATE OF BIRTH	December 3, 1926
PLACE OF BIRTH	Cincinnati
DATE OF DEATH	July 15, 2012
Place of death	Princeton , New Jersey

[1] Birth and career data according to American Men and Women of Science , Thomson Gale 2004