Ivar Waller
Encyclopedia
Ivar Waller was a Swedish professor of theoretical physics at Uppsala University
. He developed the theory of X-ray scattering by lattice vibrations of a crystal, building upon the prior work of Peter Debye
. The Debye-Waller factor
, which he introduced in his doctoral thesis in 1925, is the definitive treatment of the effect of thermal vibrations in X-ray crystallography
. He was a member of the Royal Swedish Academy of Sciences
from 1945, and the Nobel Committee for Physics
1945-1972.
One of his notable doctoral students was the quantum chemist Per-Olov Löwdin
.
Uppsala University
Uppsala University is a research university in Uppsala, Sweden, and is the oldest university in Scandinavia, founded in 1477. It consistently ranks among the best universities in Northern Europe in international rankings and is generally considered one of the most prestigious institutions of...
. He developed the theory of X-ray scattering by lattice vibrations of a crystal, building upon the prior work of Peter Debye
Peter Debye
Peter Joseph William Debye FRS was a Dutch physicist and physical chemist, and Nobel laureate in Chemistry.-Early life:...
. The Debye-Waller factor
Debye-Waller factor
The Debye–Waller factor , named after Peter Debye and Ivar Waller, is used in condensed matter physics to describe the attenuation of x-ray scattering or coherent neutron scattering caused by thermal motion. It has also been called the B factor or the temperature factor...
, which he introduced in his doctoral thesis in 1925, is the definitive treatment of the effect of thermal vibrations in X-ray crystallography
X-ray crystallography
X-ray crystallography is a method of determining the arrangement of atoms within a crystal, in which a beam of X-rays strikes a crystal and causes the beam of light to spread into many specific directions. From the angles and intensities of these diffracted beams, a crystallographer can produce a...
. He was a member of the Royal Swedish Academy of Sciences
Royal Swedish Academy of Sciences
The Royal Swedish Academy of Sciences or Kungliga Vetenskapsakademien is one of the Royal Academies of Sweden. The Academy is an independent, non-governmental scientific organization which acts to promote the sciences, primarily the natural sciences and mathematics.The Academy was founded on 2...
from 1945, and the Nobel Committee for Physics
Nobel Committee for Physics
The Nobel Committee for Physics is the Nobel Committee responsible for proposing laureates for the Nobel Prize for Physics. The Nobel Committee for Physics is appointed by the Royal Swedish Academy of Sciences...
1945-1972.
One of his notable doctoral students was the quantum chemist Per-Olov Löwdin
Per-Olov Löwdin
Per-Olov Löwdin was a Swedish physicist, professor at the University of Uppsala from 1960 to 1983, and in parallel at the University of Florida until 1993....
.