Saturated photodissociation of CsI

Grossman, Laurence W.; Hurst, G. S.; Payne, M. G.; Allman, S. L.

doi:10.1016/0009-2614(77)80682-9

Cited by 31 publications

(7 citation statements)

References 6 publications

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“…Other determinations of the absorption cross sections for alkali halides have been made for NaCl (g) at room temperature by Silver et al (1986), CsI (g) at room temperature by Grossman et al (1977), and the Cs halides at extremely high temperatures (1900-2000 K) by Mandl (1971) and Mandl (1977). Moses et al (2002) calculated a J 1 value for NaCl (g) of 8.8%10 -5 s -1 from the room temperature cross section data of Silver et al (1986).…”

Section: Photochemistry Of the Alkali Halidesmentioning

confidence: 99%

Alkali and halogen chemistry in volcanic gases on Io

Schaefer

Fegley

2005

Icarus

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Section: Photochemistry Of the Alkali Halidesmentioning

confidence: 99%

Alkali and halogen chemistry in volcanic gases on Io

Schaefer

Fegley

2005

Icarus

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“…Laser cooling and trapping [1-3], which revolutionized atomic physics, have enabled formation of molecules from cold atoms [4] and precision molecular spectroscopy [5]. Direct laser cooling of molecules shows promise for species with advantageous level structures that only require a few laser wavelengths [6-8], but is infeasible for the vast majority of molecules.Furthermore, even with trapped and cooled molecules [9], commonly used detection methods, such as state-dependent photo-dissociation or ionization [10,11], destroy the molecules under study, making them unavailable for further manipulation.In this work, we perform high resolution spectroscopy on rotational states of a molecular ion using methods that are generally applicable to a broad range of molecular ions, which are readily trapped in electromagnetic potentials [12] and cooled by coupling to co-trapped atomic ions amenable to laser cooling [13,14]. The long interrogation times and low translational temperature enabled by trapping and sympathetic cooling lead to high resolution [15], which has, among other advances, enabled the most stringent test of fundamental theory carried out by molecular ions [16].…”

mentioning

confidence: 99%

“…Furthermore, even with trapped and cooled molecules [9], commonly used detection methods, such as state-dependent photo-dissociation or ionization [10,11], destroy the molecules under study, making them unavailable for further manipulation.…”

mentioning

confidence: 99%

Frequency-comb spectroscopy on pure quantum states of a single molecular ion

Chou

Collopy

Kurz

et al. 2020

Science

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Spectroscopy is a powerful tool for studying molecules and is commonly performed on large thermal molecular ensembles that are perturbed by motional shifts and interactions with the environment and one another, resulting in convoluted spectra and limited resolution. Here, we use generally applicable quantum-logic techniques to prepare a trapped molecular ion in a single quantum state, drive terahertz rotational transitions with an optical frequency comb, and read out the final state non-destructively, leaving the molecule ready for further manipulation. We resolve rotational transitions to 11 significant digits and derive the rotational constant of 40 CaH + to be B R = 142 501 777.9(1.7) kHz. Our approach suits a wide range of molecular ions, including polyatomics and species relevant for tests of fundamental physics, chemistry, and astrophysics.Precision molecular spectroscopy produces information that is essential to understand molecular properties and functions, which underpin chemistry and biology. In particular, microwave rotational spectroscopy can precisely determine various aspects of molecular structure, such as bond lengths and angles, and help identify molecules. However, even in a dilute gas, where the interaction with surrounding molecules is reduced, spectroscopic experiments often fall short of the ultimate resolution set by the natural linewidth of the transitions. This is due to effects that crowd and blur molecular spectra, such as uncontrolled nuclear, rotational, vibrational, and electronic states, line shifts and broadening from external fields, reduced interaction time from time-of-flight, and the Doppler effect. These limitations have motivated efforts toward trapping molecules and cooling them close to absolute zero temperature. Laser cooling and trapping [1-3], which revolutionized atomic physics, have enabled formation of molecules from cold atoms [4] and precision molecular spectroscopy [5]. Direct laser cooling of molecules shows promise for species with advantageous level structures that only require a few laser wavelengths [6-8], but is infeasible for the vast majority of molecules.Furthermore, even with trapped and cooled molecules [9], commonly used detection methods, such as state-dependent photo-dissociation or ionization [10,11], destroy the molecules under study, making them unavailable for further manipulation.In this work, we perform high resolution spectroscopy on rotational states of a molecular ion using methods that are generally applicable to a broad range of molecular ions, which are readily trapped in electromagnetic potentials [12] and cooled by coupling to co-trapped atomic ions amenable to laser cooling [13,14]. The long interrogation times and low translational temperature enabled by trapping and sympathetic cooling lead to high resolution [15], which has, among other advances, enabled the most stringent test of fundamental theory carried out by molecular ions [16]. We prepare a trapped 40 CaH + molecular ion at rest in a single, known quantum state and coherently ...

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“…The efficiency shortcoming of LIF can be alleviated if the molecules that occupy the quantum state of interest can be counted more directly, by taking advantage of high quantum efficiency ion detectors and easy manipulation of ion trajectories so that the ion detectors effectively subtend 4π solid angle. Resonanceenhanced multiphoton ionization (REMPI), which allowed detection of individual neutral molecules [11,12], has been utilized more recently for the efficient measurement of molecular quantum state populations. For detecting level population in molecular ions, the difficulty of efficiently and controllably removing the second electron makes REMPI a challenging technique to apply.…”

Section: Photodissociation Detection Schemementioning

confidence: 99%

State-specific detection of trapped HfF+ by photodissociation

Ni¹,

Loh²,

Grau³

et al. 2014

Journal of Molecular Spectroscopy

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We use (1+1 ) resonance-enhanced multiphoton photodissociation (REMPD) to detect the population in individual rovibronic states of trapped HfF + with a single-shot absolute efficiency of 18%, which is over 200 times better than that obtained with fluorescence detection. The first photon excites a specific rotational level to an intermediate vibronic band at 35,000-36,500 cm −1 , and the second photon, at 37,594 cm −1 (266 nm), dissociates HfF + into Hf + and F. Mass-resolved time-of-flight ion detection then yields the number of state-selectively dissociated ions. Using this method, we observe rotational-state heating of trapped HfF + ions from collisions with neutral Ar atoms. Furthermore, we measure the lifetime of the 3 ∆ 1 v = 0, J = 1 state to be 2.1(2) s. This state will be used for a search for a permanent electric dipole moment of the electron.

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Saturated photodissociation of CsI

Cited by 31 publications

References 6 publications

Alkali and halogen chemistry in volcanic gases on Io

Alkali and halogen chemistry in volcanic gases on Io

Frequency-comb spectroscopy on pure quantum states of a single molecular ion

State-specific detection of trapped HfF+ by photodissociation

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