𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Stark effects on the B1g and Au nπ* triplet states of p-benzoquinone

✍ Scribed by Hendrik Veenvliet; Douwe A. Wiersma

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
333 KB
Volume
22
Category
Article
ISSN
0009-2614

No coin nor oath required. For personal study only.

✦ Synopsis

The results of polarized Stark effect absorption esperimcnts on the lower triplet states ofp-benzoquinone (PBQ)-h4 and -dq in single crystals at 1.8"K are reported. These measurements give strong support for the assignment of the lowest triplet state as triplet 3B transition at 18602.8 cm-' ,g (nn*). The origin of this state in PBQ-h, is observed as an electric field induced and is interpreted as the g-inversion level of a double-minimum potential well. The lint observed at 18619.7 cm-' in the PBQ-114 crystal is therefore assigned as the u-inversion level of this double well with A,, (B,p@b , ,,) total symmetry. Its intensity manifests the strong vibronic coupling that occurs among the B [g and p . -.-A, nn triplet states along b,, -type nuclear motions.

📜 SIMILAR VOLUMES

Stark and zeeman effects on the singlet
Stark and zeeman effects on the singlet nπ* state of s-triazine
✍ R.M. Hochstrasser; A.H. Zewail 📂 Article 📅 1971 🏛 Elsevier Science 🌐 English ⚖ 289 KB

The lowest singlet state of &riazine is characterized as 'E" arising fro? k' -+ err promotion (II+ IC\*). The state has angular morn&turn corresponding tog = 0.24. The state is also subject to a fkst+nier Stark effect (a = 0.53D) due to electric field induced interactions of 2s and 2p eIectrons. we

Polarization of the triplet-singlet-nπ*-
Polarization of the triplet-singlet-nπ*-luminescence of p-benzoquinone and p-toluquinone
✍ W. Herre; P. Weis 📂 Article 📅 1970 🏛 Elsevier Science 🌐 English ⚖ 220 KB

The spectra of phosphorescence and of the degree of anisotropy of p-benzoquinone and of p-toluquinone have been investigated iu elassv solutions at -180°C. The phosphorescence of these compounds is assigned to a symmetry fokidden T' (nn\*j -S-transition.

On some properties of the lowest nπ* and
On some properties of the lowest nπ* and ππ* triplet states of benzaldehyde
✍ C. Mijoule; P. Yvan 📂 Article 📅 1976 🏛 Elsevier Science 🌐 English ⚖ 391 KB

Scmi-cmpnlck~l calculations dre rcportcd for the lowest nn\* and BIT\* clcctromc triplet statcs of berwaldchydc. IIqulhbrmm gcomctrws, spin drpole-dlpolc and spin-orbIt contributions to the 2I.S paramcterr; ns well .IS oscillator strcngthP 1) + SO arc presented and discussed for both states.

Observation of two n-π singlet states in
Observation of two n-π singlet states in the single crystal absorption spectrum of p-benzoquinone and toluquinone
✍ H.P. Trommsdorff 📂 Article 📅 1971 🏛 Elsevier Science 🌐 English ⚖ 411 KB

The single crystal absorption spectra of p-benzoquinonc and toluquinone have been observed at 4.2OK for three perpendicular directions of polarization. The electronic otQins of the two n-n\* transitions are located; their separation amounts to 255 cm-\* inp-benzoquinone and 560 cm-l in toluquinone.