Matrix Isolation Method for the Experimental Study of Unstable Species

Whittle, E.; Dows, David A.; Pimentel, George C.

doi:10.1063/1.1739957

Cited by 299 publications

(132 citation statements)

References 1 publication

Supporting

Mentioning

128

Contrasting

Unclassified

Order By: Relevance

“…By studying the high resolution IR spectra of SF 6 doped in helium droplets, Toennies et al measured the temperature of droplets is T =0.38 K for pure 4 He (T =0.15 K, 3 He) [9,10], which has been consistent with theoretical estimation. The experimental results indicate that helium droplets are the finite-sized superfluid system.…”

Section: Introductionsupporting

confidence: 55%

“…In 1938, the ultra-cold superfluity helium has been discovered by Kapitza [1] and Allen et al [2] independently. Later Whittle et al developed the technique of cryogenic matrix isolation for spectroscopic studies [3]. Although helium droplets were considered as the ideal spectroscopic matrix, the first application has been achieved by Toennies et al in 1990s [4−7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Helium Droplets: An Apparatus to Study Ultra Cold Chemistry

Zhang

Huang

et al. 2013

Chinese Journal of Chemical Physics

View full text Add to dashboard Cite

A new pulsed helium nano droplets machine has been constructed. The droplets were generated by expansion of the pure helium through the cryogenic valve attached to a closed-cycle cryostat. The mean size of helium droplets can be controlled between 10 3 and 10 5 helium atoms by tuning the backing pressure (10−40 bar) and temperature (10−30 K). Compared with the continuous-flow beam source, the density of droplet is at least one order of magnitude higher, which offers the opportunity to combine the system with the commercial pulsed laser to study chemical reactions inside of the superfluid helium at ultra-low temperature. The performance for the system has been checked by studying the photodissociation of CH 3 I doped droplets at 252 nm with the velocity map imaging technique. The photofragments, CH 3 , were detected by (2+1) resonance enhanced multiphoton ionization. The speed and angular distributions derived from resulting images show clear evidence of the relaxation effect by the surrounding helium atoms. The pulsed helium droplets depletion spectroscopy was also demonstrated. The depletion spectrum of benzene doped helium droplets indicates that less than 3% depletion can be observed with the newly constructed apparatus.

show abstract

Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Helium Droplets: An Apparatus to Study Ultra Cold Chemistry

Zhang

Huang

et al. 2013

Chinese Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…The pioneering studies of Vegard led to the realization that low temperature solids, and in particular rare gases, provide an excellent medium for studies of free radicals and ionic species, and motivated the development of matrix isolation spectroscopy as a useful spectroscopic technique [2], which was discussed in a number of review articles [3,4].…”

Section: S Smentioning

confidence: 99%

Thermoactivation spectroscopy of solid Ar doped with N2

Ponomaryov

Savchenko

Khizhniy

et al. 2007

Low Temperature Physics

View full text Add to dashboard Cite

A new modification of low-temperature activation spectroscopy technique for real-time correlated study of relaxation processes in cryogenic solids was developed. This enabled us to measure simultaneously thermally stimulated exoelectron emission (TSEE) and spectrally resolved thermally stimulated luminescence (TSL) in the range from 200 to 1100 nm. This paper presents the results on TSL and TSEE from solid Ar doped with N 2 exposed to irradiation by low-energy electron beam (500 eV) during deposition. The TSEE and TSL yields were measured at the heating rate of 3.

show abstract

“…Two decades earlier, Whittle et al proposed the matrix isolation technique as a mean to study chemical reaction and chemical compounds. 2 One of their first experiments discovered the IR-driven cis-trans isomerization reaction of nitrous acid ͑HONO͒ which proved to be a prototype proton transfer system. Probably the most tantalizing aspect of this reaction is its very high cis → trans quantum yield, qualitatively approaching unity, 3,4 following IR excitation of OH stretch vibration.…”

Section: Introductionmentioning

confidence: 99%

Intramolecular vibrational energy relaxation in nitrous acid (HONO)

Botan

Hamm

2008

The Journal of Chemical Physics

View full text Add to dashboard Cite

Intramolecular vibrational energy relaxation (IVR) in nitrous acid (HONO) is studied with the help of ultrafast two-color pump-probe spectroscopy. In a previous paper [V. Botan et al., J. Chem. Phys. 124, 234511 (2006)], it has been observed that trans-HONO cools through a cascade of overtones of one specific mode after pumping the OH stretch vibration. We had suggested that this cooling mode is the ONO bend vibration. Furthermore, molecules that have initially been excited by the OH stretch vibration of cis-HONO and then underwent isomerization follow the same relaxation pathway. In the present study, we extend the investigation of IVR of cis-and trans-HONO to the N=O stretch and HON bend spectral regions, finding further evidence that the bottleneck of trans cooling is indeed the ONO bend vibration. In combination with information on the anharmonic coupling constants of different modes, the energy relaxation dynamics preceding this cooling cascade can also be followed in unprecedented detail. Intramolecular vibrational energy relaxation ͑IVR͒ in nitrous acid ͑HONO͒ is studied with the help of ultrafast two-color pump-probe spectroscopy. In a previous paper ͓V. Botan et al., J. Chem. Phys. 124, 234511 ͑2006͔͒, it has been observed that trans-HONO cools through a cascade of overtones of one specific mode after pumping the OH stretch vibration. We had suggested that this cooling mode is the ONO bend vibration. Furthermore, molecules that have initially been excited by the OH stretch vibration of cis-HONO and then underwent isomerization follow the same relaxation pathway. In the present study, we extend the investigation of IVR of cis-and trans-HONO to the N = O stretch and HON bend spectral regions, finding further evidence that the bottleneck of trans cooling is indeed the ONO bend vibration. In combination with information on the anharmonic coupling constants of different modes, the energy relaxation dynamics preceding this cooling cascade can also be followed in unprecedented detail. Intramolecular vibrational energy relaxation in nitrous acid "HONO…

show abstract

Matrix Isolation Method for the Experimental Study of Unstable Species

Cited by 299 publications

References 1 publication

Helium Droplets: An Apparatus to Study Ultra Cold Chemistry

Helium Droplets: An Apparatus to Study Ultra Cold Chemistry

Thermoactivation spectroscopy of solid Ar doped with N2

Intramolecular vibrational energy relaxation in nitrous acid (HONO)

Contact Info

Product

Resources

About