The Pyrazines.

Krems, Irving J.; Spoerri, Paul E.

doi:10.1021/cr60126a004

Cited by 149 publications

(176 citation statements)

References 81 publications

(111 reference statements)

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“…They argued that efficient sympathetic cooling of OH molecules in the ground vibrational state by collisions with Rb atoms is unlikely to occur due to the large inelastic rate coefficient. External fields can also have important effects on ultracold molecular collisions [45,46,47]. Avdeenkov and Bohn investigated the effect of external fields on ultracold collisions between OH or OD molecules [48,49,50].…”

Section: Introductionmentioning

confidence: 99%

Formation of molecular oxygen in ultracoldO+OHcollisions

2009

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We discuss the formation of molecular oxygen in ultracold collisions between hydroxyl radicals and atomic oxygen. A time-independent quantum formalism based on hyperspherical coordinates is employed for the calculations. Elastic, inelastic and reactive cross sections as well as the vibrational and rotational populations of the product O2 molecules are reported. A J-shifting approximation is used to compute the rate coefficients. At temperatures T = 10 − 100 mK for which the OH molecules have been cooled and trapped experimentally, the elastic and reactive rate coefficients are of comparable magnitude, while at colder temperatures, T < 1 mK, the formation of molecular oxygen becomes the dominant pathway. The validity of a classical capture model to describe cold collisions of OH and O is also discussed. While very good agreement is found between classical and quantum results at T = 0.3 K, at higher temperatures, the quantum calculations predict a larger rate coefficient than the classical model, in agreement with experimental data for the O + OH reaction. The zero-temperature limiting value of the rate coefficient is predicted to be about 6 × 10 −12 cm 3 molecule −1 s −1 , a value comparable to that of barrierless alkali-metal atom -dimer systems and about a factor of five larger than that of the tunneling dominated F + H2 reaction.

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Section: Introductionmentioning

confidence: 99%

Formation of molecular oxygen in ultracoldO+OHcollisions

2009

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“…The possibility of creating small ensembles of ultracold atoms and molecules has opened a new research in atomic, molecular and optical physics [1]- [3]. These include applications in condensed-matter physics [4], in the measurement of fundamental constants [5], in quantum computing [6,7] and in ultracold chemistry [8,9].…”

Section: Introductionmentioning

confidence: 99%

Ultra-cold ion–atom collisions: near resonant charge exchange

2008

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Abstract. Accurate calculations of the near resonant charge exchange crosssections in HD + , HT + and DT + at very low energies are presented. The charge exchange process between an ion and its parent atom is a near resonant process that becomes inelastic when two different isotopes are involved. We find that, at very low energies, the charge exchange cross-section follows Wigner's law for inelastic processes and becomes much larger than the cross-section for elastic collisions which tends to a finite limit. The efficiency of inelastic charge exchange increases as the mass difference between the two isotopes decreases. Contents

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“…Cold heteronuclear alkali dimers are subject to a large interest since they can be formed at temperatures below 1 mK [1,2,3,4,5] and possess a large permanent electric dipole moment for deeply bound singlet levels [6,7]. This combination of properties enables electric field control of ultracold collisions [8,9] and cold chemical reactions [10,11] and holds promises for applications in quantum computation [12]. Precise potential energy curves, in particular for the lowest electronic states, are evidently important for such applications as well as for understanding the molecule formation processes (photoassociation), ro-vibrational state selective detection [5,13] and for formation of vibrational ground-state molecules [14].…”

Section: Introductionmentioning

confidence: 99%

XΣ+1andaΣ+
Staanum
¹
,
Pashov
²
,
Knöckel
³

et al. 2007
Phys. Rev. A
119
9
59
2
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We present the first high-resolution spectroscopic study of LiCs. LiCs is formed in a heat pipe oven and studied via laser-induced fluorescence Fourier-transform spectroscopy. By exciting molecules through the X 1 Σ + -B 1 Π and X 1 Σ + -D 1 Π transitions vibrational levels of the X 1 Σ + ground state have been observed up to 3 cm −1 below the dissociation limit enabling an accurate construction of the potential. Furthermore, rovibrational levels in the a 3 Σ + triplet ground state have been observed because the excited states obtain sufficient triplet character at the corresponding excited atomic asymptote. With the help of coupled channels calculations accurate singlet and triplet ground state potentials were derived reaching the atomic ground state asymptote and allowing first predictions of cold collision properties of Li + Cs pairs.

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The Pyrazines.

Cited by 149 publications

References 81 publications

Formation of molecular oxygen in ultracoldO+OHcollisions

Formation of molecular oxygen in ultracoldO+OHcollisions

Ultra-cold ion–atom collisions: near resonant charge exchange

XΣ+1andaΣ+
Staanum
¹
,
Pashov
²
,
Knöckel
³

et al. 2007
Phys. Rev. A
119
9
59
2
View full text Add to dashboard Cite

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The Pyrazines.

Cited by 149 publications

References 81 publications

Formation of molecular oxygen in ultracoldO+OHcollisions

Formation of molecular oxygen in ultracoldO+OHcollisions

Ultra-cold ion–atom collisions: near resonant charge exchange

XΣ+1andaΣ+Staanum1, Pashov2, Knöckel3 et al. 2007Phys. Rev. A1199592View full textAdd to dashboardCite

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XΣ+1andaΣ+
Staanum
¹
,
Pashov
²
,
Knöckel
³

et al. 2007
Phys. Rev. A
119
9
59
2
View full text Add to dashboard Cite