NDLI: Photoelectron spectroscopy of the trimethylenemethane negative ion

Content Provider	Springer Nature Link
Author	Wenthold, Paul G. Hu, Jun Squires, Robert R. Lineberger, W. Carl
Copyright Year	1999
Abstract	The photoelectron spectrum of the trimethylenemethane (TMM) negative ion is described. The electron affinity of TMM is found from the spectrum to be 0. 431±0.006 eV, and the energy difference between the $$\tilde X^3 A'_2 $$ $^{3}$A′$_{2}$ and $$\tilde b^1 A_1 $$ $^{1}$A$_{1}$ states of TMM is determined to be 16.1±0.2 kcal/mol. The energy difference between the lowest energy triplet and singlet states is estimated to be 13–16 kcal/mol. The enthalpy of formation of TMM is measured to be 70±3 kcal/mol, and the C-H bond enthalpy in 2-methylallyl radical is 90±2 kcal/mol. Previously unobserved vibrational frequencies of 425, 915, and 1310 cm$^{−1}$ are found for the triplet state of TMM, whereas a frequency of 325 cm$^{−1}$ is found for the singlet state. In addition, an overtone peak is observed for the triplet state at 1455 cm$^{−1}$, and both states contain peaks that are assigned to bands arising from excited vibrational levels of the ion.
Starting Page	800
Ending Page	809
Page Count	10
File Format	PDF
ISSN	10440305
Journal	Journal of The American Society for Mass Spectrometry
Volume Number	10
Issue Number	9
e-ISSN	18791123
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Institution	The American Society for Mass Spectrometry
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry Biotechnology Organic Chemistry Proteomics Bioinformatics
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Structural Biology

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