Pre-processing in vibrational spectroscopy - when, why and how
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Data pre-processing is essential when dealing with spectral scatter, which represents unwanted data variations. This paper explores pre-processing techniques to identify and mitigate scatter, offering insights into data characteristics and common challenges.
Area Of Science
- Spectroscopy
- Data Analysis
- Chemometrics
Background
- Spectral data often contains unwanted variations, referred to as scatter.
- Scatter can arise from light scattering or other sources of noise.
- Effective pre-processing is crucial for accurate data interpretation.
Purpose Of The Study
- To elucidate the significance of scatter in spectral data analysis.
- To demonstrate the utility of pre-processing methods in managing scatter.
- To provide practical examples and highlight common pitfalls in pre-processing.
Main Methods
- Exploration of pre-processing techniques for scatter removal.
- Case studies illustrating the application of pre-processing methods.
- Analysis of information revealed by pre-processing about data quality.
Main Results
- Pre-processing is vital when spectral scatter is present.
- Scatter can be defined broadly as unwanted data variation.
- Specific pre-processing methods can effectively remove certain types of scatter.
Conclusions
- Understanding and addressing scatter through pre-processing is key to reliable spectral data analysis.
- Pre-processing provides valuable insights into the nature of spectral data.
- Awareness of common pitfalls can improve the application of pre-processing techniques.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...