Experimental setup for laser spectroscopy of molecules in a high magnetic field

Takazawa, Yasuyuki Kimura and Ken
January 2011
Review of Scientific Instruments;Jan2011, Vol. 82 Issue 1, p013108
Academic Journal
An experimental setup to measure the effects of a high magnetic field on the structure and decay dynamics of molecules is designed and constructed. A vacuum chamber is mounted in the bore of a superconducting magnet. A molecular beam passes in the chamber. Pulsed laser light excites the molecules in the field. The parent or fragment ions are extracted by an electric field parallel to the magnetic field. They are detected by a microchannel plate. Their mass and charge are determined by the time-of-flight method. The performance of the setup was examined using resonance-enhanced two-photon ionization through the X2 Π-A2Σ+ transition of nitric oxide (NO) molecules. The ions were detected with sufficient mass resolution to discriminate the species in a field of up to 10 T. This is the first experiment to succeed in the mass-selective detection of ions by the time-of-flight method in a high magnetic field. By measuring NO+ ion current as a function of the laser frequency, the X2Π-A2 Σ+ rotational transition lines, separated clearly from the background noise, were observed in fields of up to 10 T. From the relative strengths of the transition lines, the ion detection efficiency was determined as a function of the magnetic field strength. This setup was shown to be applicable in a field higher than 10 T. The Landau levels of molecules were successfully observed to demonstrate the setup.


Related Articles

  • Laser spectroscopy on molecular beam with a time-of-flight mass spectrometer operating in a strong magnetic field. Kimura, Y.; Kitahama, Y.; Takazawa, K. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Apr2006, Vol. 38 Issue 1, p203 

    Experimental set-up for studying effects of a strong magnetic field on a structure and a decay dynamics of molecules, was designed and constructed. A vacuum chamber, in which a molecular beam propagated, was mounted in a bore of a superconducting magnet. Laser light crossed the molecular beam in...

  • Sub-Doppler laser spectroscopy of the 1B2(1Δu) state of CS2 in a cold molecular beam. Habib, A.; Görgen, R.; Brasen, G.; Lange, R.; Demtröder, W. // Journal of Chemical Physics;8/15/1994, Vol. 101 Issue 4, p2752 

    Sub-Doppler excitation spectra of CS2 in the spectral range 30200-32300 cm-1 have been extensively measured with a frequency-doubled single mode cw dye laser in a cold collimated argon beam, seeded with CS2. From the rotational analysis of the measured spectra, the geometry and the position of...

  • Laser spectroscopy of the v[sub 1] + 3v[sub 3] absorption band in [sup 12]C[sub 2]H[sub 2]. I. ... Herregodts, F.; Hurtmans, D.; Auwera, J. Vander; Herman, M. // Journal of Chemical Physics;11/1/1999, Vol. 111 Issue 17, p7954 

    Discusses the use of an autoscan laser spectroscopy to perform a detailed study of vibrational overtones in polyatomic molecules, with applications to intramolecular dynamics and bond-selected chemistry. Experimental setup; Pressure self-broadening coefficients; Absolute line intensities.

  • Molecular beam optical Stark study of the [18.1] 2Π1/2-X 4Σ1/2- band system of rhodium monosulfide. Tongmei Ma; Hailing Wang; Steimle, Timothy C. // Journal of Chemical Physics;9/28/2007, Vol. 127 Issue 12, p124311 

    The optical Stark effect in the RR13(0.5) branch feature of the [18.1] 2Π1/2-X 4Σ1/2- (v′,v″=0) band of rhodium monosulfide (RhS) has been recorded and analyzed to determine the permanent electric dipole moment μe of 3.40(2) D for the ground X 4Σ1/2- (v=0) state and an...

  • Fully epitaxial Fe/MgO/Fe(001) junctions with nonmagnetic metal layer insertion. Niizeki, T.; Mitani, S.; Sukegawa, H.; Kasai, S.; Inomata, K. // Journal of Applied Physics;Apr2011, Vol. 109 Issue 7, p07C726 

    Fully epitaxial Fe/Ag-wedge/MgO/Fe(001) magnetic tunnel junctions (MTJs) were prepared by using a combination of magnetron sputtering and molecular beam epitaxy, and their magneto-transport properties were investigated for the Ag thickness range of 0-9 monolayer (ML). The large tunneling...

  • Design of a scanning tunneling microscope for in situ observation of the interactions of molecular beams with surfaces. Fogarty, D. P.; Kandel, S. A. // Review of Scientific Instruments;Aug2005, Vol. 76 Issue 8, p083708 

    We describe an ultrahigh vacuum scanning tunneling microscope (UHV-STM) that is interfaced to a pulsed molecular-beam source. Optimization of the vibration isolation of the STM and molecular beam source allows a sample to be imaged before, during, and after molecular-beam dosing, without ever...

  • Quantitative determination of the 3D dipole orientation of single molecules. D�barre, A.; Jaffiol, R.; Julien, C.; Nutarelli, D.; Richard, A.; Tch�nio, P.; Chaput, F.; Boilot, J.-P. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Jan2004, Vol. 28 Issue 1, p67 

    Recently, different approaches have been implemented to detect single molecules with an optical dipole out of the sample plane. Principles to solve this problem of general interest have been laid but no detailed analysis has been performed to date. This paper is devoted to a quantitative...

  • Frequency measurements in the b 3?(0u+) - X 1Sg+ system of K2. Sherstov, I.; Liu, S.; Lisdat, Ch.; Schnatz, H.; Jung, S.; Kn�ckel, H.; Tiemann, E. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Mar2007, Vol. 41 Issue 3, p485 

    Absolute transition frequencies of the b 3?(0u+) - X 1Sg+ system of K2 were measured in a molecular beam with Lamb dip absorption spectroscopy applying a frequency comb from a femtosecond pulsed laser. Both, K atoms and K2 molecules are present in the beam and are expected to interact by...

  • Key role of molecular kinetic energy in early stages of pentacene island growth. Wu, Yu; Toccoli, Tullio; Zhang, Jian; Koch, Norbert; Iacob, Erica; Pallaoro, Alessia; Iannotta, Salvatore; Rudolf, Petra // Applied Physics A: Materials Science & Processing;Apr2009, Vol. 95 Issue 1, p21 

    Organic molecular beam deposition is studied systematically at thermal and hyperthermal regimes aiming at investigating the role of molecular kinetic energy on the growth mechanism of pentacene submonolayers on SiO x/Si. We show that the kinetic energy of the impinging molecule ( E k) plays a...


Read the Article


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

Try another library?
Sign out of this library

Other Topics