Inicio  /  Instruments  /  Vol: 5 Par: 1 (2021)  /  Artículo
ARTÍCULO
TITULO

A Sustainable Slit Jet FTIR Spectrometer for Hydrate Complexes and Beyond

Hannes C. Gottschalk    
Taija L. Fischer    
Volker Meyer    
Reinhard Hildebrandt    
Ulrich Schmitt and Martin A. Suhm    

Resumen

Fourier transform infrared (FTIR) absorption spectroscopy of cold molecules and clusters in supersonic slit jet expansions complements and extends more sensitive action spectroscopy techniques and provides important reference data for the latter. We describe how its major drawback, large substance and carrier gas consumption, can be alleviated by one to two orders of magnitude via direct and continuous recycling of the gas mixture. This is achieved by a combination of dry rotary lobe and screw pump compression. The signal-to-noise ratio is boosted by the established buffered giant gas pulse technique with full interferogram synchronization. The buildup of water impurities typically limits the recycling gain, but is turned into a feature for the study of hydrate complexes of volatile molecules. Continuous operation with a single gas filling over several days becomes practical and useful. Decadic absorbances in the low ppm range are detectable and the mid infrared range can be recorded simultaneously with the near infrared. The less straightforward hydration number assignment of spectral features in direct absorption spectroscopy is supported by a gradual water buildup at a rate of less than 0.5 mg/h. A recent reassignment proposal for the water dimer OH stretching spectrum is refuted and vibrational spectra of vacuum-isolated 18 18 O-water clusters are presented for the first time. Methanol docking on asymmetric ketones is used to illustrate the advantages and limitations of the recycling concept. Previous assignments of the hydrate complex of 1-phenylethanol are confirmed. Additional features of the setup await testing and refinement, but the recycling technique already substantially widens the applicability of direct absorption spectroscopy of neutral molecular clusters. It may be attractive for other high-throughput jet spectrometers.

 Artículos similares

       
 
Jacek Wojtas    
Precision metrology is important for understanding and monitoring various phenomena, especially in special and scientific applications. The subject of the article covers selected aspects of the study of high-resolution measurements of the absorption spec... ver más
Revista: Applied Sciences

 
Mingxia Wu, Zhiheng Ma, Yu Fan, Yuetao Wu, Zhongxun An, Hongbin Zhao, Yanli Liu and Jiaqiang Xu    
To guarantee the security of new energy vehicles (NEV), which include energy storage devices such as batteries, a quartz crystal microbalance (QCM) sensor was designed to detect online the HF gas produced from the leakage of electrolyte in the power syst... ver más
Revista: Coatings

 
Angela Kapitanovic and Helena Otmacic Curkovic    
The new bronze objects of art are almost always patinated before their exposure outdoors or indoors. Among the many patination methods used by practitioners, sulphide patination is one of the most common techniques. The aim of this work is to examine the... ver más
Revista: Coatings

 
Victor D. Telekh, Aleksei V. Pavlov, Daniil V. Kirillov, Evgeny V. Vorob?ev, Alexander G. Turyanskiy, Viacheslav M. Senkov, Petr A. Tsygankov, Freddy F. Parada-Becerra, Vladimir R. Vesnin and Andrei S. Skriabin    
This study discusses the main features of the irradiation of prospective multilayer coatings by VUV/UV radiation from compressed plasma flows. Such radiation is characterized by a broadband spectrum and high brightness fluxes. Oxide and Mo/Si bilayers we... ver más
Revista: Coatings

 
Jie Yang, Zhibo Zhou, Tianji Lu and Ling Shen    
The present work reports the identification of inorganic and organic materials applied in gildings of Kizil Grottoes mural paintings, located in the western part of China. A total of 10 gold gilding samples were collected from caves dated in the fourth?s... ver más
Revista: Applied Sciences