Comment on ‘‘The weakest bond: Experimental observation of helium dimer’’ [J. Chem. Phys. 98, 3564 (1993)]

Meyer, Eric S.; Mester, John C.; Silvera, Isaac F.
March 1994
Journal of Chemical Physics;3/1/1994, Vol. 100 Issue 5, p4021
Academic Journal
Recently, Luo et al. reported indirect evidence for the formation of dimers in a supersonic expansion of helium. They interpreted their data as confirmation of the existence of a bound state of 4He–4He with a binding energy of order 1 mK. We show that their data are actually consistent with the formation of helium trimers and not dimers. The two control experiments that they performed do not provide any evidence for discarding this alternative hypothesis.


Related Articles

  • Delayed ionization following photoexcitation of small clusters of refractory elements: Nanofilaments. Amrein, Andreas; Simpson, Richard; Hackett, Peter // Journal of Chemical Physics;3/15/1991, Vol. 94 Issue 6, p4663 

    Photoionization of small clusters of the refractory elements niobium, tantalum, and tungsten at 308 nm is interpreted in terms of a sequential two-photon excitation mechanism in which a rapid coupling between electronic and vibrational degrees of freedom is proposed. Ionization is slow and may...

  • Ionization and fragmentation of clusters evaporated from the surface of a metal by accelerated ions. Voıtsekhovskiı, I. A.; Medvedeva, M. V.; Ferleger, V. Kh. // Technical Physics;Dec97, Vol. 42 Issue 12, p1371 

    A mechanism is proposed for the ionization of clusters evaporated from the surface of a metal subjected to fast-ion bombardment. According to this mechanism, part of the internal energy of the cluster nuclei is transferred to its electronic subsystem, with subsequent ionization. Within the...

  • Dynamics of molecules and clusters in intense laser-light fields. Yamanouchi, Kaoru // AIP Conference Proceedings;2002, Vol. 611 Issue 1, p3 

    The investigation of the dynamical behavior of molecules in intense laser fields has afforded us invaluable opportunities to understand fundamentals of the interaction between molecules and light fields as well as to manipulate molecules using characteristics of laser light fields. In the...

  • Multiphoton ionization studies of clusters of immiscible liquids. II. C6H6–(H2O)n, n=3–8 and (C6H6)2–(H2O)1,2. Garrett, Aaron W.; Zwier, Timothy S. // Journal of Chemical Physics;3/1/1992, Vol. 96 Issue 5, p3402 

    Resonant two-photon ionization (R2PI) time-of-flight mass spectroscopy is used to record S0–S1 spectra of the neutral complexes C6H6–(H2O)n with n=3–8 and (C6H6)2–(H2O)1,2. Due to limitations imposed by the size of these clusters, a number of vibronic level arguments...

  • Ionization potentials of cobalt–sodium bimetallic clusters (ConNam). Hoshino, Kuniyoshi; Naganuma, Takashi; Yamada, Yoshiyuki; Watanabe, Katsura; Nakajima, Atsushi; Kaya, Koji // Journal of Chemical Physics;9/1/1992, Vol. 97 Issue 5, p3803 

    Cobalt–sodium bimetallic clusters (ConNam, n=3–48) were produced by a two independent laser-vaporization method. Ionization potentials of the ConNam clusters were measured up to m=3 using a tunable ultraviolet laser combined with a time-of-flight (TOF) mass spectrometer. In...

  • Structure and stability of Mg+n and Mg++n clusters (n≤7). Durand, G. // Journal of Chemical Physics;11/15/1989, Vol. 91 Issue 10, p6225 

    We present a nonempirical model Hamiltonian of the valence bond type for singly and doubly charged clusters of atoms which have a s2(1S) ground state configuration. This model includes delocalization, instantaneous polarization energies, interaction between induced dipoles, and Coulombic...

  • Short-time charge motion in He[sup +][sub n] clusters. Jeonghee Seong; Janda, Kenneth C. // Journal of Chemical Physics;12/22/1998, Vol. 109 Issue 24, p10873 

    Investigates the ionization of helium[sub n][sup +] clusters. Application of the time-dependent wave packets for the electronic states; Use of the diatomics-in-molecules potential for eigenvalue calculations of positively charged clusters; Characterization of delocalization distance and direction.

  • Dissociation and suppressed ionization of H[sub 2]O molecules embedded in He clusters: The role of the cluster as a cage. Kanaev, A. V.; Museur, L.; Laarmann, T.; Monticone, S.; Castex, M. C.; von Haeften, K.; Mo¨ller, T. // Journal of Chemical Physics;12/8/2001, Vol. 115 Issue 22, p10248 

    Electronic structure and energy transfer in H[sub 2]O doped He[sub N] clusters (Napprox. 10[sup 4]) is studied with photoexcitation in the spectral range of 140–40 nm (9–30 eV). The reaction dynamics is investigated by fluorescence of neutral OH[sup *] and H[sup *] and ionic H[sub...

  • Formation of anomalous odd-numbered carbon cluster ions in the gas-phase coalescence reactions of fullerenes. Zhu, Lei; Wang, Shenyi; Li, Yufen // Journal of Chemical Physics;11/15/1994, Vol. 101 Issue 10, p8592 

    We report the observation of efficient coalescence reactions of fullerenes in the negative ion channel by laser desorption ionization of chemical adduct compounds of C60. Not only the even-numbered daughter fullerenes by successive C2 losses or captures appeared, but also odd-numbered carbon...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics