| Author | Message | ||
     iyas (iyas) Advanced Member Username: iyas Post Number: 23 Registered: 7-2007 |
dear all thanks for your kind answers i want to ask if there is nir spectrum for SO2 | ||
| Charles E. Miller (millerce) Junior Member Username: millerce Post Number: 7 Registered: 10-2006 |
The HITRAN database (http://www.cfa.harvard.edu/hitran/) contains the fundamental spectroscopic parameters of many small molecules, and includes a software client that allows one to generate vibrational spectra of these molecules under various conditions. I have found this database to be very useful for several of my projects. Information regarding HITRAN, as well as the software client, can be obtained from the website. Good luck with your research. - Chuck | ||
| Ana Garrido-Varo (garrido) New member Username: garrido Post Number: 2 Registered: 1-2006 |
Hello Iyas I have not expertise in the NIRS analysis of gases but I know that several projects are studying onboard multispectral and hyperspectral sensors to measure greenhouse gases as CO2, CH4, etc. Try to find information about with the following key words: Trace gases, CO2, SO2, hyperspectral imagery, multispectral airbone sensors, hyperspectral aitbone sensors.... Start by Google Schoolars and then go to your University electronic journals database Have also a look in the following links you may find some gases spectra, I think http://science.widener.edu/svb/ftir/ir_co2.html you will find the Co2 spectrum http://www.lpi.usra.edu/meetings/lpsc1996/pdf/1055.pdf you will find the SO2 spectrum http://www.wag.caltech.edu/home/jang/genchem/infrared.htm http://books.google.es/books?id=RaJdy3_VINQC&pg=RA2-PA83&lpg=RA2-PA83&dq=NIR+spectrum+SO2+and+CO2&source=bl&ots=onBfLzRTE3&sig=u286Fx_G5ZheKLaWAMjcRD72Aao&hl=es&ei=4C5jSrjfIYGUjAe59J3xDw&sa=X&oi=book_result&ct=result&resnum=8 http://www.prod.sandia.gov/cgi-bin/techlib/access-control.pl/2003/031980.pdf Patience and curiosity will help you in your self-learning process, Good luck!! Ana | ||
| Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 236 Registered: 9-2001 |
Peter - only the symmetric stretch mode of CO2 would be IR-inactive. The asymmetric stretch mode and the bending modes are active, as testified to by the existence of the spectrum at the link you supplied. Also, don't forget that every mid-IR spectroscopist knows that CO2 and H2O are the main atmospheric interferences in any IR spectral measurement. \o/ /_\ | ||
| Peter Tillmann (tillmann) Intermediate Member Username: tillmann Post Number: 17 Registered: 11-2001 |
Hello iyas, as far as I know, CO2 is symetrical and therefore IR inaktiv. According to theory there would be no IR or NIR vibrational spectrum. You ought to look for RAMAN spectra instead. Regarding SO2 there are detialed data on band assignments given in Burns and Ciurczak (2001) page 13 f. for the IR region. If you need a graph, http://webbook.nist.gov/chemistry/form-ser.html is a good choice for IR spectra. If you look there for CO2 and IR spectrum, you will find an IR spectrum of CO2 as well. Peter | ||
| iyas (iyas) Advanced Member Username: iyas Post Number: 22 Registered: 7-2007 |
if you please i am trying to find the NIR specturm of co2 and also so2 in the gas state ihave read about explanation of these specturms in circuzak nir book , handbook of near infared spectroscopy 2001 and 2007 but i need the the nir or ir spectrum of co2 and so2 for my thesis ,becuase i am postgraduate student |