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

Berninger, Martin; Stefanov, André; Deachapunya, Sarayut; Arndt, Markus

doi:10.1103/physreva.76.013607

Cited by 83 publications

(107 citation statements)

References 31 publications

(35 reference statements)

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“…Numerical simulations substantiate the observation that metal amino acid complexes formed under near room-temperature conditions are more stable and more easily detected than their metal-free analogs. The presence and detectability of these unusually large compounds is expected to be of importance for future experiments in molecule interferometry and metrology [11] as it allows one to gradually tune the cluster mass with elements that are much more intricate and variable than pure metal or semiconductor clusters alone. The gradual addition of water vapor in future experiments shall also allow us to explore the stability of giant metal amino acid clusters in a solvating biomimetic environment [36].…”

Section: Discussionmentioning

confidence: 99%

“…Our work, presented here, focuses on the gas-phase formation of neutral biomolecular clusters as did already some very early studies in the field [1]. Such experiments are often motivated by the desire to better identify the role of solvation and desolvation for the relative importance of various binding forces in organic clusters and molecules [5].The particle's neutrality is also an important criterion in efforts to establish new beam methods for quantum interferometry with molecular matter waves [6-9] as well as for precision metrology on large molecules [10][11][12]. Neutral molecules are much better isolated from any electromagnetic environment and they may therefore propagate coherently, without noticeable perturbation, even in a rather noisy field environment.…”

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confidence: 99%

“…The particle's neutrality is also an important criterion in efforts to establish new beam methods for quantum interferometry with molecular matter waves [6-9] as well as for precision metrology on large molecules [10][11][12]. Neutral molecules are much better isolated from any electromagnetic environment and they may therefore propagate coherently, without noticeable perturbation, even in a rather noisy field environment.…”

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Gas-phase formation of large neutral alkaline-earth metal tryptophan complexes

Marksteiner

Haslinger

Sclafani

et al. 2008

J. Am. Soc. Mass Spectrom.

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We report on the first observation of isolated large neutral metal amino acid complexes such as TrpnMek, with Me == Ca, Ba, Sr, cluster combinations covering n = 1. ..33, k = 0..2 and masses beyond 6500 u. The cluster beam is generated using UV laser desorption from a mixed powder of alkaline-earth metal salts and tryptophan inside a cluster mixing chalU1el. The particles are detected using VUV photoionization followed by time-of-flight mass spectroscopy. The enhanced stability of metal amino acid clusters over pure amino acid clusters is substantiated in molecular dynamics simulations by determining the gain in binding energy related to the inclusion of the metal atoms. . The majority of studies so far focused on the generation and use of ionic species. Our work, presented here, focuses on the gas-phase formation of neutral biomolecular clusters as did already some very early studies in the field [1]. Such experiments are often motivated by the desire to better identify the role of solvation and desolvation for the relative importance of various binding forces in organic clusters and molecules [5].The particle's neutrality is also an important criterion in efforts to establish new beam methods for quantum interferometry with molecular matter waves [6-9] as well as for precision metrology on large molecules [10][11][12]. Neutral molecules are much better isolated from any electromagnetic environment and they may therefore propagate coherently, without noticeable perturbation, even in a rather noisy field environment.Biomolecular clusters are exciting study objects for future matter wave experiments as they permit one to scale the mass in well-defined steps, while at the same time changing the internal properties in an intriguing way: the number of possible conformations as well as the number of allowed configurational and vibrational transitions scales exponentially with the size of the cluster [13], and it is still an open question how this will affect de Broglie interferometry [14], which formally considers only the center of mass motion alone. (19]. But it has still remained a challenge to find reproducible methods for photoionizing biomolecules and complexes with masses exceeding 3000 u [17,20,21].The formation and photo-detection of small amino acid [22] and nucleotide clusters [23], both hydrated and solvent-free, were already reported for objects up to 1400 u. Ultracold small bioclusters can be formed by pick-up in helium nano-droplets [24]. Complexes formed between metal atoms and amino acids were also studied to understand their structure [25], their fragmentation pathways [26,27], and metal ion affinities [28].Here we extend these investigations to much larger organometallic complexes composed of up to more than 30 tryptophan molecules with masses exceeding 6500 u, that can still be detected using VUV photoionization and time-of-flight mass spectrometry. ExperimentalWe generate the molecular macroclusters using pulsed laser evaporation and collisional cooling: the pulsed beam of aNd:YAG laser (Quantel...

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Section: Discussionmentioning

confidence: 99%

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Gas-phase formation of large neutral alkaline-earth metal tryptophan complexes

Marksteiner

Haslinger

Sclafani

et al. 2008

J. Am. Soc. Mass Spectrom.

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“…First experiments along this line were recently able to apply this idea to near-field interferometry for measuring the static [4] and optical [5] polarizability α stat and α opt as well as the total electric susceptibility χ tot of molecules. The latter may also contain additional information about static or time varying electric dipole moments [6].…”

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Quantum interference distinguishes between constitutional isomers

et al. 2010

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Matter waves, as introduced by de Broglie in 1923 [1], are a fundamental quantum phenomenon, describing the delocalized center of mass motion of massive bodies and we show here their sensitivity to the molecular structure of constitutional isomers.In quantum textbooks, matter wave phenomena are often associated with the equation λ dB = h/(mv), where the de Broglie wavelength λ dB is only determined by Plancks constant h and the particles momentum p = mv. It is a common conjecture that this relation still holds for bodies of arbitrary mass, size and complexity. But what is the role of the detailed internal molecular composition if λ dB does not include any such information?As already shown before [2], the centre of mass motion can be well described by quantum delocalization and interference of each entire molecule with itself -even if the internal atoms may populate a thermal mixture of vibrational and rotational modes at a temperature of about T = 500 K. The conceptual separation of the internal and external degrees of freedom allows us to discuss two different cases:If the interaction between the molecule and its environment makes it possible, even only in principle, to retrieve position information, the initially delocalized particle will be localized and quantum interference can no longer occur [3].The second case is of particular relevance for our present experiment: All individual atoms in a given molecular structure will add up to determine its global properties, and in particular also its electrical susceptibility. The susceptibility can couple to an external electric field and thus influence the center of mass motion of the entire particle. In this way, the internal structure becomes influential for the external motion, even though the molecule remains still widely delocalized and capable of showing de Broglie interference.First experiments along this line were recently able to apply this idea to near-field interferometry for measuring the static [4] and optical [5] polarizability α stat and α opt as well as the total electric susceptibility χ tot of molecules. The latter may also contain additional information about static or time varying electric dipole moments [6]. It has therefore been suggested that different molecular conformations might eventually also be distinguished in quantum interference experiments [7].For demonstration purposes we here compare two tailor-made model compounds 1 and 2. The design * http://www.quantumnano.at; markus.arndt@univie.ac.at † marcel.mayor@unibas.ch of both is based on our recent findings in molecular electronics which showed a considerable delocalization of the π-system in rod-like oligo phenylene ethynylene (OPE) [8,9] on the one hand and a partition of the π-system by conjugation interrupting subunits like e.g. platinum complexes [10], perpendicular torsion angles [11,12] or sp 3 -carbon atoms on the other hand. The constitutional isomers 1 and 2 both have the chemical formula C 49 H 16 F 52 and an identical molecular weight of 1592 g mol −1 , but different polari...

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“…They led to matter wave optics developments based on electrons, neurons, protons, atoms and molecules, even on large molecules such as fullerene (C 60 ) [17]- [22]. They led for instance to the construction of electron microscopes, with magnitudes 5000 times higher than light microscopes [23], and to numerous applications in different sciences and techniques.…”

Section: De Broglie's Program Validationmentioning

confidence: 99%

Wave-Particle Duality in Einstein-de Broglie Programs

Elbaz¹

2014

JMP

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The standard model of particle physics forms a consistent system for universe description. After following quantum mechanics, it derives particles from relativistic quantum fields. Since it does not include gravitation, it describes only one aspect of the universe. In extension of general relativity, Einstein had proposed a symmetrical and complementary approach of physics. In his program, he privileged a relativist field based on representations for physical phenomena, before a precise mathematical description. It allows completing and unifying the universe description, like both eyes for relief vision, and both ears for stereophonic audition. We propose to show it with many simple examples.

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

Cited by 83 publications

References 31 publications

Gas-phase formation of large neutral alkaline-earth metal tryptophan complexes

Gas-phase formation of large neutral alkaline-earth metal tryptophan complexes

Quantum interference distinguishes between constitutional isomers

Wave-Particle Duality in Einstein-de Broglie Programs

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