𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Lifetimes of vibrational levels in the B̃2A′ state of HCO

✍ Scribed by Joseph D. Tobiason; Eric A. Rohlfing

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
771 KB
Volume
252
Category
Article
ISSN
0009-2614

No coin nor oath required. For personal study only.

✦ Synopsis

We measure the fluorescence decays for low-lying rotational states in the first eight vibrational levels of HCO B 2.aL Some long-lived decays exhibit weak quantum beats that we attribute to a higher-order hyperfine perturbation in the 13 state. We estimate fluorescence quantum yields by combining measured fluorescence intensities and a calculated electronic transition moment. The estimated nonradiative decay rates increase with increasing vibrational excitation and exhibit mode specificity. We discuss possible vibronic coupling mechanisms, including spin-orbit coupling to quartet states and predissociation via the ~kLH(2/~ ') and ~2p~ states.

📜 SIMILAR VOLUMES

Comment on “Lifetimes of vibrational lev
Comment on “Lifetimes of vibrational levels in the B̃ 2A′ state of HCO”
✍ H. Bitto; Robert T. Carter 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 131 KB

Arguments are put forward that the quantum beats in the B 2~ electronic state of HCO attributed to a higher-order hyperfine perturbation by Tobiason and Rohlfing are most likely due to well-known hyperfine quantum beats. In contrast to Tobiason and Rohlfing's interpretation, hyperfine perturbations

Reply to the comment on “Lifetimes of vi
Reply to the comment on “Lifetimes of vibrational levels in the B̃ 2A′ state of HCO”
✍ Joseph D. Tobiason; Eric A. Rohlfing 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 110 KB

The preceding Comment by Bitto and Carter objects to our interpretation of the weak quantum beats observed for particular rovibrational states of B 2K HCO in the title article and postulates that the observed beats are anisotropic hyperfine quantum beats. We concur with their Comment, acknowledge th

Radiative lifetime of the HCO B̃2A′ stat
Radiative lifetime of the HCO B̃2A′ state
✍ Ying Jen Shiu; I-Chia Chen 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 395 KB

The fragment HCO, produced from acetaldehyde by photolysis at 300 nm, was detected by laser-induced fluorescence of B 'A'g 'A' transitions. The fluorescence lifetimes of the HCO B state decrease rapidly as the photolysis energy increases, indicating strong predissociation of the B state. The radiati

Lifetimes of C-2 in rotational levels of
Lifetimes of C-2 in rotational levels of the B̃2Σ+u state in the gas phase
✍ Samuel Leutwyler; John P. Maier; Liubomir Misev 📂 Article 📅 1982 🏛 Elsevier Science 🌐 English ⚖ 250 KB

Llteumcs OTC; m rotational levels of the E':i. d = 0, acet) Icnc and r~regas merastablcs and the 6'~: -%kg u' = I states have been measured. Cl was produced from bromotransltion uas laser excited The hfetlmes are constant wthm a vlbrdttonal level, 77 \* 8 ns for u' = 0 and 73 r 7 ns for v = I. The o

Fluorescence Excitation Spectra of HCO B
Fluorescence Excitation Spectra of HCO B̃̃2A′−X̃2A′ in a Supersonic Jet
✍ Y.J. Shiu; I.C. Chen 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 350 KB

The HCO radical was produced by photolysis of acetaldehyde in a supersonic molecular jet. HCO \(\hat{B}^{2} A^{\prime}-\tilde{X}^{2} A^{\prime}\) transitions were detected by laser-induced fluorescence. Eight vibronic bands were observed that showed both \(a\) - and \(b\)-type transitions, indicatin

Predissociation lifetimes of the B̃ and
Predissociation lifetimes of the B̃ and C̃ Rydberg states of CH3I
✍ Jack A. Syage 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 457 KB

Single-photon direct absorption and resonance-enhanced multiphoton ionization excitation spectra were recorded for CHJ in a jet-cooled molecular beam. The rovibrationally cold molecules yield lineshapes that are lifetime broadenend by predissociation. Lorentzian fitswere used to extract lifetimes f