Electric Dipole Moments of Water Clusters from a Beam Deflection Measurement

Moro, Ramiro; Rabinovitch, Roman; Chen, Xia; Kresin, Vladimir Z.

doi:10.1103/physrevlett.97.123401

Cited by 62 publications

(66 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As mentioned above, the amount of dephasing will then allow the extraction of a numerical value for the moments. For hot molecular beams which possess a permanent electric dipole moment the system behaves as an object with only an induced polarizability [28]. Therefore, dipole moments could already be measured in our current setup by only replacing the source.…”

mentioning

confidence: 99%

Polarizability measurements of a molecule via a near-field matter-wave interferometer

et al. 2007

View full text Add to dashboard Cite

We apply near-field matter-wave interferometry to determine the absolute scalar polarizability of the fullerenes C60 and C70. A key feature of our experiment is the combination of good transmission and high spatial resolution, gained by wide molecular beams passing through sub-micron gratings. This allows to significantly facilitate the observation of field-dependent beam shifts. We thus measure the polarizability to be α = 88.9 ± 0.9 ± 5.1Å3 for C60 and to α = 108.5 ± 2.0 ± 6.2Å 3 for C70.

show abstract

mentioning

confidence: 99%

Polarizability measurements of a molecule via a near-field matter-wave interferometer

et al. 2007

View full text Add to dashboard Cite

show abstract

“…where m is the cluster mass, v its velocity, V is the applied voltage and C is a calibrated geometrical coefficient [10].…”

Section: Resultsmentioning

confidence: 99%

Electric Dipole Moments of Nitric Acid-Water Complexes Measured by Cluster Beam Deflection

Moro¹,

Heinrich²,

Kresin³

2009

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Abstract. Water clusters embedding a nitric acid molecule HNO 3 (H 2 O) n=1−10 are investigated via electrostatic deflection of a molecular beam. We observe large paraelectric susceptibilities that greatly exceed the electronic polarizability, revealing the contribution of permanent dipole moments. The moments derived from the data are also significantly higher than those of pure water clusters. An enhancement in the susceptibility for n=5,6 and a rise in cluster abundances setting in at n=6 suggest that dissociation of the solvated acid molecule into ions takes place in this size range.

show abstract

“…There exists a convenient observable which directly reflects electrical charge distribution within a system: the electric dipole moment p. Indeed, measurements of |p| by electrostatic deflection of cluster beams have served as a valuable probe of structure and bonding [36][37][38]. However, there have been only few applications of the method to water clusters [39][40][41]. In the present report we use beam deflection to provide a new experimental angle onto the problem of acidic dissociation: a measurement of the electric dipole moment of (H 2 O) n clusters carrying a DCl molecule.…”

Section: Introductionmentioning

confidence: 99%

“…1(a). The first important observation is that peaks assigned to mixed clusters display a much larger response, attesting to the presence of a polar impurity.Water clusters formed in a hot nozzle expansion will cool by evaporation, and evaporative ensemble theory [57-59] predicts a resultant T≈200 K. This temperature was employed previously with the same setup to analyze the deflection of neat water clusters [39] and is close to T rot =167 K fitted to the deflection profiles of the D 2 O molecule [60]. Using this value and the measured α eff , we obtain the root-mean-square (rms) values of the dipole moment p plotted in Fig.…”

mentioning

confidence: 99%

Electric Dipole Moments of Nanosolvated Acid Molecules in Water Clusters

2015

Self Cite

View full text Add to dashboard Cite

The electric dipole moments of (H 2 O) n DCl (n=3-9) clusters have been measured by the beam deflection method. Reflecting the (dynamical) charge distribution within the system, the dipole moment contributes information about the microscopic structure of nanoscale solvation.The addition of a DCl molecule to a water cluster results in a strongly enhanced susceptibility.There is evidence for a noticeable rise in the dipole moment occurring at n≈5-6. This size is consistent with predictions for the onset of ionic dissociation. Additionally, a molecular dynamics model suggests that even with a nominally bound impurity an enhanced dipole moment can arise due to the thermal and zero point motion of the proton and the water molecules. The experimental measurements and the calculations draw attention to the importance of fluctuations in defining the polarity of water-based nanoclusters, and generally to the essential role played by motional effects in determining the response of fluxional nanoscale systems under realistic conditions. 2 INTRODUCTION.Water clusters are convenient experimental platforms for the study of the microscopic physics and chemistry of solvation. By monitoring cluster properties as a function of the number of water molecules, it is possible to follow the step-by-step progression of intermolecular interactions [1], following the transition from isolated molecule to bulk By virtue of having a large fraction of their molecules located near the surface, clusters can serve as surrogates for important processes occurring on aerosols and hydrometeors [2,3]. Composed of only a finite number of constituents, they often serve as test beds for theoretical methods and models.Small water clusters doped with an acid molecule -here, for concreteness, hydrogen chloride -have been the subject of a great number of theoretical papers and a sizeable (but regrettably much smaller) number of experimental ones. Hydrogen chloride readily dissociates into H 3 O + and Cl -and the dissociation also takes place in HCl hydrates [4][5][6][7][8], on the ice surface [9][10][11][12] or on larger water nanoparticles [13][14][15] and protonated water cluster ions [16,17]. One inquiry that persistently threads its way through this subject is: what is the minimum quantity of water molecules, (H 2 O) n , required to dissociate the acid [18]? According to calculations, the acidically dissociated structure is supported starting from n=4; most of the theoretical approaches agree that at this size the dissociated form represents the global minimum on the potential energy surface [18][19][20][21][22][23][24]. Experimentally, for neutral clusters the question has been probed by laser spectroscopy (see, e.g., [25][26][27][28]) but finding a conclusive spectroscopic signature of the onset of dissociation in a nanocluster is not straightforward.As a matter of fact, the challenge is not just experimental but conceptual. The free water clusters in natural and laboratory environments generally exist at temperatures appreciably above absolute zero ...

show abstract

Electric Dipole Moments of Water Clusters from a Beam Deflection Measurement

Cited by 62 publications

References 25 publications

Polarizability measurements of a molecule via a near-field matter-wave interferometer

Polarizability measurements of a molecule via a near-field matter-wave interferometer

Electric Dipole Moments of Nitric Acid-Water Complexes Measured by Cluster Beam Deflection

Electric Dipole Moments of Nanosolvated Acid Molecules in Water Clusters

Contact Info

Product

Resources

About