Infrared spectroscopy in supersonic free jets and molecular beams

Rovibrationally resolved, Fourier-transform near infrared spectroscopy of the ν1 and ν2 vibrations of the HCl dimer in a supersonic jet

“…The lack of application of FTIR supersonic jet spectroscopy to the rovibrational analysis of weakly bound dimers and clusters has been attributed to sensitivity limitations of the technique. 2 In this paper, we demonstrate the capabilities and limitations of a FTIR supersonic jet spectroscopic method suitable for such investigations. We have chosen to investigate the near infrared spectra of the HCl dimer because it has been previously extensively characterized using highly sensitive near infrared difference frequency spectrometers.…”

“…Fourier transform infrared spectroscopic methods do, however, have characteristics that make them appealing for corresponding investigations in supersonic jets. 2 In particular, the broad bandwidth of Fourier-transform near infrared (FTIR) techniques and their ability to cover the infrared spectral region between 10-10 000 cm -I by simply changing a small number of sources, beam splitters and detectors are advantages that deserve serious consideration for such applications. The lack of application of FTIR supersonic jet spectroscopy to the rovibrational analysis of weakly bound dimers and clusters has been attributed to sensitivity limitations of the technique.…”

High frequency wavelength modulation cw slit jet diode laser spectrometer for characterizing ground state intermolecular hydrogen bonded vibrations

“…Since the first rovibrational analyses of intramolecular vibrations in homomolecular [1,2] and heteromolecular hydrogen bonded complexes [3,4] using near infrared laser spectroscopy, there have been a wide range of supersonic jet, molecular beam and static gas phase studies of such species [5][6][7][8] and ionic clusters [9,10]. The overriding objectives of such studies have been the investigation of fundamentals, overtones, hotbands and combination vibrations that will permit characterization and modeling of these fundamentally important and ubiquitous molecular interactions.…”

Recent Advances in Rovibrationally Resolved FTIR Supersonic Jet Spectroscopy of Transients, Weakly Bound Dimers and Trimers

“…Spectroscopic investigations using supersonic expansions now cover the electromagnetic spectrum from the vacuum ultraviolet to the microwave and even into the radio frequency region with a wide range of spectroscopic techniques and detection arrangements [I]. The impact of high resolution infrared investigations on the determination of molecular structure and dynamics has been profound [3]. However, in the infrared spectral region, laser-based techniques have received overwhelming attention and have dominated current progress in supersonic jet and particularly in skimmed collimated molecular beam spectroscopic research [ 11. The broad bandwidth of FTIR techniques and their ability to cover the infrared spectral region between 10 -10000 cm-by simple alteration of the system resources (IR source, detector and beam splitter combination), make this technique particularly appealing for certain investigations in supersonic jets.…”

“…Since the initial FTIR supersonic free jets investigations of Snavely et al [4 -61, the majority of such investigations have focused on absorption studies. Until very recently, the majority of such absorption studies have also been carried out in neat jets or with seeded molecules in limited dilutions of carrier gas [3,81. Many of these initial FTIR absorption studies were carried out at moderate resolution (0.06 cm-') in neat supersonic jets.…”