The E3Π–X3Δ Transition of Jet-Cooled TiO Observed in Absorption

Kobayashi, Kaori; Hall, Gregory E.; Muckerman, James T.; Sears, Trevor J.; Merer, A. J.

doi:10.1006/jmsp.2002.8543

Cited by 24 publications

(20 citation statements)

References 42 publications

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“…According to this author, the electronic transition moment functions for the systems of TiO are obtained over a large enough range of r values that no uncertainty is introduced into the calculated radiative lifetime, which is in agreement with the experiments (e.g. Kobayashi et al ). However, for radiative association rate coefficient calculations, transition moments are needed over a large range of internuclear distances.…”

Section: Radiative Associationsupporting

confidence: 81%

“…Dobrodey () used the MRCI method to examine electronic transition moments and oscillator strengths, extending the work of Langhoff () to 10 singlets and 10 triplet states of TiO. Other calculations on TiO, but only for five low‐lying states, were reported by Kobayashi et al () using SA‐CASSCF/IC‐MRCI methods. Recently, Miliordos & Mavridis () have constructed complete potential energy curves for a large number of states of TiO at the restricted coupled‐cluster singlet doubles quasi‐perturbative connected triplet (MRCI/RCCSD(T)) level.…”

Section: Radiative Associationmentioning

confidence: 99%

“…Because of its astrophysical importance, the TiO molecule is the most investigated gas‐phase transition metal oxide experimentally. A review of extensive spectroscopic data bases for the TiO molecule can be found in Amiot, Luc & Vetter (), Kobayashi et al () and Ram et al ().…”

Section: Radiative Associationmentioning

confidence: 99%

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Radiative association of Ti and O atoms

Andreazza

Almeida

Vichietti

et al. 2012

Monthly Notices of the Royal Astronomical Society

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Rate coefficients for the radiative association of titanium and oxygen atoms to form the titanium monoxide (TiO) molecule are estimated. The radiative association of Ti(3F) and O(3P) atoms is dominated by an approach along the C3Δ potential energy curve, accompanied by spontaneous emission into the X3Δ ground state of TiO. For temperatures ranging from 300–14 000 K, the total rate coefficients are found to vary from 4.76 × 10−17 to 9.96 × 10−17 cm3 s−1, respectively.

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Section: Radiative Associationsupporting

confidence: 81%

Section: Radiative Associationmentioning

confidence: 99%

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Radiative association of Ti and O atoms

Andreazza

Almeida

Vichietti

et al. 2012

Monthly Notices of the Royal Astronomical Society

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“…While titanium monoxide has been extensively studied in the optical (e.g., Kobayashi et al 2002) and at high-resolution in the millimeter band (Steimle et al 1990;Namiki et al 1998), and the chemically and structurally related dioxides ZrO 2 and HfO 2 have been investigated at high-resolution in the gas phase (Brugh et al 1999;Lesarri et al 2002), spectroscopic work on TiO 2 is scarce, and that performed to date has only been at low resolution. In those studies, TiO 2 was generated either by vaporization ( Weltner & McLeod 1965;McIntyre et al 1971) or laser ablation (Chertihin & Andrews 1995), and then isolated in solid rare gas matrices, where it was studied by visible and infrared (IR) spectroscopy (Weltner & McLeod 1965;McIntyre et al 1971) or by IR spectroscopy only (Chertihin & Andrews 1995).…”

Section: Introductionmentioning

confidence: 99%

The Rotational Spectrum of TiO₂

Brünken

Müller

Menten

et al. 2008

ApJ

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The rotational spectrum of titanium dioxide (TiO 2 ) has been detected by laser-ablation molecular beam Fourier transform microwave spectroscopy. Thirteen b-type rotational transitions up to J ¼ 9 and K a ¼ 4 were measured for the most abundant isotopic species 48 TiO 2 in the frequency range 7Y42 GHz with accuracies of 1Y10 kHz, allowing for the precise determination of rotational and centrifugal distortion parameters. In addition, eight and six rotational transitions of the rare isotopic species 46 TiO 2 and 50 TiO 2 , respectively, have been recorded in the same frequency range. From the derived spectroscopic parameters, rest frequencies of TiO 2 can now be calculated to better than 1 km s À1 in equivalent radial velocity up to fairly high J and K a at millimeter wavelengths, enabling radioastronomical searches for this stable, highly polar transition metal dioxide in space. Preliminary results of two searches for TiO 2 in space are presented.

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“…More recently, the E 3 Π-X 3 Δ transition has been studied using frequency-modulated laser absorption methods in the nearinfrared (Kobayashi et al 2002); in this work, spectroscopic constants for the excited E state were determined. The B 3 Π state has been extensively characterized by Amiot et al (2002), as well.…”

Section: Introductionmentioning

confidence: 99%

MILLIMETER/SUBMILLIMETER SPECTROSCOPY OF TiO (X³Δ_r): THE RARE TITANIUM ISOTOPOLOGUES

Lincowski

Halfen

Ziurys

2016

ApJ

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Pure rotational spectra of the rare isotopologues of titanium oxide, 46 TiO, 47 TiO, 49 TiO, and 50 TiO, have been recorded using a combination of Fourier transform millimeter-wave (FTmmW) and millimeter/submillimeter direct absorption techniques in the frequency range 62-538 GHz. This study is the first complete spectroscopic characterization of these species in their X 3 Δ r ground electronic states. The isotopologues were created by the reaction of N 2 O or O 2 and titanium vapor, produced either by laser ablation or in a Broida-type oven, and observed in the natural Ti isotopic abundances. Between 10 and 11 rotational transitions J + 1 « J were measured for each species, typically in all 3 spin-orbit ladders Ω=1, 2, and 3. For 47 TiO and 49 TiO, hyperfine structure was resolved, originating from the titanium-47 and titanium-49 nuclear spins of I=5/2 and 7/2, respectively. For the Ω=1 and 3 components, the hyperfine structure was found to follow a classic Landé pattern, while that for Ω=2 appeared to be perturbed, likely a result of mixing with the nearby isoconfigurational a 1 Δ state. The spectra were analyzed with a case (a) Hamiltonian, and rotational, spin-orbit, and spin-spin parameters were determined for each species, as well as magnetic hyperfine and electric quadrupole constants for the two molecules with nuclear spins. The most abundant species, 48 TiO, has been detected in circumstellar envelopes. These measurements will enable other titanium isotopologues to be studied at millimeter wavelengths, providing Ti isotope ratios that can test models of nucleosynthesis.

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The E3Π–X3Δ Transition of Jet-Cooled TiO Observed in Absorption

Cited by 24 publications

References 42 publications

Radiative association of Ti and O atoms

Radiative association of Ti and O atoms

The Rotational Spectrum of TiO₂

MILLIMETER/SUBMILLIMETER SPECTROSCOPY OF TiO (X³Δ_r): THE RARE TITANIUM ISOTOPOLOGUES

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The E3Π–X3Δ Transition of Jet-Cooled TiO Observed in Absorption

Cited by 24 publications

References 42 publications

Radiative association of Ti and O atoms

Radiative association of Ti and O atoms

The Rotational Spectrum of TiO2

MILLIMETER/SUBMILLIMETER SPECTROSCOPY OF TiO (X3Δr): THE RARE TITANIUM ISOTOPOLOGUES

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Product

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The Rotational Spectrum of TiO₂

MILLIMETER/SUBMILLIMETER SPECTROSCOPY OF TiO (X³Δ_r): THE RARE TITANIUM ISOTOPOLOGUES