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Issue 21, 2001
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Feshbach states of the propadienylidene anion H2CCC

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The absorption spectra of the propadienylidene anions, H2CCC and D2CCC, in the visible and near-UV range were recorded by photodetachment spectroscopy. The lowest excited state is the well characterized dipole bound Ã2A1 showing bound levels and vibrational Feshbach resonances. The higher lying electronic states are Feshbach resonances 0.5–2 eV above the electron detachment threshold and are assigned to the [B with combining tilde]2A″, [C with combining tilde]2A1 and [D with combining tilde] 2B1[X with combining tilde]2B1 electronic transitions by means of ab initio calculations. The autodetachment rate increases with energy. A comparison of the laboratory data with diffuse interstellar bands shows that not only the four strong transitions of the à 2A1[X with combining tilde]2B1 system but also several of the Feshbach resonances lie close to astronomical absorptions.

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Article information

20 Jun 2001
03 Sep 2001
First published
05 Oct 2001

Phys. Chem. Chem. Phys., 2001,3, 4674-4678
Article type

Feshbach states of the propadienylidene anion H2CCC

M. Tulej , F. Güthe , M. V. Pachkov, K. Tikhomirov, R. Xu, M. Jungen and J. P. Maier, Phys. Chem. Chem. Phys., 2001, 3, 4674
DOI: 10.1039/B105415P

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