Henryk Witek

Using computational methods, he carried out simulations of infrared spectra of Criegee intermediates (CH2OO).{{cite journal|title=Infrared Absorption Spectrum of the Simplest Criegee Intermediate CH2OO|volume=340|issue=6129|pages=174–176|url=https://www.science.org/doi/full/10.1126/science.1234369|journal=Science|access-date=2013-11-28|doi=10.1126/science.1234369|pmid=23580523|year=2013|last1=Su|first1=Y.-T.|last2=Huang|first2=Y.-H.|last3=Witek|first3=H. A.|last4=Lee|first4=Y.-P.|bibcode=2013Sci...340..174S|s2cid=31499893}} This achievement (published in Science) has important implications on the understanding of fundamental processes in environmental chemistry.{{cite web|title=NCTU chemists make air pollution breakthrough|url=http://taiwantoday.tw/ct.asp?xitem=204231&CtNode=416|publisher=Taiwan Today|access-date=2013-12-08|date = 2013-04-18}}{{cite web|title="Elusive atmospheric intermediates reveal some secrets" Chemistry World, 2013-12-04|url=http://www.rsc.org/chemistryworld/2013/04/criegee-intermediates-atmospheric-chemistry-aerosols|access-date=2014-01-07}}

• Henryk A. Witek, Takahito Nakijima, Kimihiko Hirao, "Relativistic and correlated all-electron calculations on the ground and excited states of AgH and AuH", J. Chem. Phys. 113, 8015 (2000).
• Henryk A. Witek, Stephan Irle, Keiji Morokuma, "Analytical second-order geometrical derivatives of energy for the self-consistent-charge density-functional tight-binding method", J. Chem. Phys. 121, 5163 (2004).
• Su YT, Huang YH, Witek HA, Lee YP, "Infrared absorption spectrum of the simplest Criegee intermediate CH2OO", Science 340, 174 (2013).

In 2005, he obtained Young Faculty Award and Scholarship from the Foundation for the Advancement of Outstanding Scholarship.{{cite web|title=Henryk Witek - CV |url=http://ts2c2.flas.kps.ku.ac.th/cv_ispeaker/CV-Henryk_A_Witek.pdf |access-date=2014-01-11 |archive-url=https://web.archive.org/web/20140111143121/http://ts2c2.flas.kps.ku.ac.th/cv_ispeaker/CV-Henryk_A_Witek.pdf |archive-date=2014-01-11 |url-status=dead }} In 2006, he became one of four awardees of the American Chemical Society Outstanding Junior Faculty Award,{{cite web|title=The OpenEye Outstanding Junior Faculty Award in Computational Chemistry|url=http://web2011.acscomp.org/awards/the-comp-acs-outstanding-junior-faculty-award|access-date=2014-01-08}} in 2010, he received the Distinguished Young Chemist Award from the Chinese Chemical Society,{{cite web|title=Chinese Chemical Society - Awards (in Chinese)|url=http://chemistry.org.tw/award1.php|access-date=2014-01-10|archive-date=2014-01-10|archive-url=https://web.archive.org/web/20140110131812/http://chemistry.org.tw/award1.php|url-status=dead}} and in 2014, he was awarded the APATCC Pople Medal "for his innovative contributions to theoretical and mathematical aspects of quantum chemistry, particularly his contributions to multireference perturbation theory and the density-functional tight-binding method".{{cite web|title=APATCC - Awards|url=http://www.apatcc.org/awards.html#awardwinners|access-date=2014-05-29}}

As an academic teacher, he offers semestral courses in general and quantum chemistry. Some of them are available online via the OpenCourseWare platform.{{cite web|title=Online courses via OpenCourseWare |url=http://140.113.86.231/site/channels/55?locale=zh_tw |access-date=2013-11-28 |url-status=dead |archive-url=https://web.archive.org/web/20131203015711/http://140.113.86.231/site/channels/55?locale=zh_tw |archive-date=2013-12-03 }}

In fall 2017, he taught "Perturbation theory for linear operator", using the book titled the same as the course by mathematician Tosio Kato.

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