Featured Research

from universities, journals, and other organizations

Warm Water Vibrates For Longer

Date:
February 6, 2004
Source:
Netherlands Organization For Scientific Research
Summary:
Dutch researcher Arjan Lock has investigated the behaviour of vibrating water molecules. Using ultra-short laser pulses, he found that hydrogen atoms in water molecules vibrate for longer at higher temperatures. This is abnormal because in the majority of substances a vibration lives shorter at higher temperatures.

Dutch researcher Arjan Lock has investigated the behaviour of vibrating water molecules. Using ultra-short laser pulses, he found that hydrogen atoms in water molecules vibrate for longer at higher temperatures. This is abnormal because in the majority of substances a vibration lives shorter at higher temperatures.

Lock studied the OH-stretch vibration in water. He found that the lifetime of the OH-stretch vibration, a vibration of a hydrogen atom with respect to the oxygen atom, is extremely short in water, just 0.26 picoseconds (0.26 millionth, millionth of a second). The energy is then transferred from the OH-stretch vibration to a bend vibration in water.

At a higher temperature the lifetime of the vibration increases. This is completely contrary to the expected behaviour because in the majority of substances, the duration of the vibration is shorter at higher temperatures. In water however, higher temperatures weaken the hydrogen bonds and as a result of this the lifetime of the vibration increases. After a certain period of time, the hydrogen atom will stop vibrating with respect to the oxygen atom and the vibrational energy will then be transferred to other movements. The time span in which that occurs is termed the lifetime of the vibration. If the molecule has a hydrogen bond, the frequency of the OH-stretch vibration decreases and the lifetime of the vibration changes.

The lifetime of the vibration is a measure of the strength of the hydrogen bonds. Hydrogen bonds are weak bonds between the hydrogen atom in one molecule and the oxygen atom in another molecule. These bonds bind the individual water molecules together.

Lock used a special ultrafast infrared laser for his experiments. This laser provides extremely short light pulses: 0.2 picoseconds. As these are slightly shorter than the duration of the vibrations, they can be used to carefully follow the behaviour of the vibrations.

In the experiments the researcher used two light pulses. The first energy-rich pulse causes the molecules to vibrate. With the second pulse Lock could examine how many molecules were still vibrating at a certain point in time after the first pulse. A water molecule that is still vibrating will not absorb the energy from the second light pulse. By measuring how much light passes through the water, the number of water molecules still vibrating can be determined.

The research was funded by the Netherlands Organisation for Scientific Research.


Story Source:

The above story is based on materials provided by Netherlands Organization For Scientific Research. Note: Materials may be edited for content and length.


Cite This Page:

Netherlands Organization For Scientific Research. "Warm Water Vibrates For Longer." ScienceDaily. ScienceDaily, 6 February 2004. <www.sciencedaily.com/releases/2004/02/040206084932.htm>.
Netherlands Organization For Scientific Research. (2004, February 6). Warm Water Vibrates For Longer. ScienceDaily. Retrieved September 19, 2014 from www.sciencedaily.com/releases/2004/02/040206084932.htm
Netherlands Organization For Scientific Research. "Warm Water Vibrates For Longer." ScienceDaily. www.sciencedaily.com/releases/2004/02/040206084932.htm (accessed September 19, 2014).

Share This



More Earth & Climate News

Friday, September 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Wildfires in CA Burn Forest Asunder

Raw: Wildfires in CA Burn Forest Asunder

AP (Sep. 18, 2014) An out-of-control Northern California wildfire has nearly 2,800 people from their homes as it continues to grow, authorities said Thursday. Authorities said a man has been arrested on suspicion of arson for starting the fire on Saturday. (Sept. 18) Video provided by AP
Powered by NewsLook.com
Raw: Elephant Undergoes Surgery in Tbilisi Zoo

Raw: Elephant Undergoes Surgery in Tbilisi Zoo

AP (Sep. 18, 2014) Grand the elephant has successfully undergone surgery to remove a portion of infected tusk at Tbilisi Zoo in Georgia. British veterinary surgeons used an electric drill to extract the infected piece. (Sept. 18) Video provided by AP
Powered by NewsLook.com
Raw: Scientists Examine Colossal Squid

Raw: Scientists Examine Colossal Squid

AP (Sep. 16, 2014) Squid experts in New Zealand thawed and examined an unusual catch on Tuesday: a colossal squid. It was captured in Antarctica's remote Ross Sea in December last year and has been frozen for eight months. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Man Floats for 31 Hours in Gulf Waters

Man Floats for 31 Hours in Gulf Waters

AP (Sep. 16, 2014) A Texas man is lucky to be alive after he and three others floated for more than a day in the Gulf of Mexico when their boat sank during a fishing trip. (Sept. 16) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins